①It was about 600 years ago that the first clock with a face and an hour hand was made. ②It was they that (who ) cleaned the classroom yesterday.

③It was in the street that I met her father. ④It was yesterday that I met her in the street. ⑤It is you that /who are wrong.

特例:It is not until + 被强调部分 + that ... 该句型也是强调句型。主要用于强凋时间状语,译成汉语"直到...才...",可以说是 not ... until ... 的强调形式。   It was not until she took off her dark glasses that I realized she was a famous film star.

= Not until she took off her dark glasses did I realize she was a famous film star.

= I didn’t realize she was a famous film star until she took off her dark glasses.

Choose the best answer 1.It took us over an hour _______ along the street.  A.walk    B.to walk C.walking     D.walked  2.I think it a great honour _______to visit your country.  A.to invite B.inviting  C.having invited  D.to be invited  3.Many people now make _______a rule to buy cards for their friends before Christmas.  A.themselves  B.it  C.that  D.this  4. _______is very clear to everyone that he's round and tall like a tree.  A.This  B.What  C.That  D.It  5.In the United States, bus travel doesn't cost much as train travel, _______?  A.don't they  B.does it  C.do they  D.doesn't it  6.Someone is at the door, who is _______?  A.this  B.that  C.it  D.he  7.-It is raining cats and dogs.  - _______ .  A.So it is B.So is it  her it is her is it  8.-My home is in that tall building over there.  -_______ ?  it see  see it  be seen it  it be seen  9. _______ raining hard for 3 hours without stopping.  A.It is  B.It was  C.It has been  D.It had been  10.-Has the boy got his bicycle now?  -Yes, the police gave _______.  A.him to him  B.it to it   C.it to him  D.him to it  11.It's no use _____ over spilt milk.  A.cry  B.crying  C.that you cry  D.for you to cry  12.It is important _______ their offer.  A.reject  B.rejects  C.to reject  D.rejecting  13.Has _______been decided when we are to hold the sports-meeting?  A.that  B.this  C.it  D.what  14.-Did Li Lei call me while I was out?  -Yes, it was _______ that called you.  A.him  B.he  C.who  D.whom  15.Nothing is wrong with the radio _______?  A.isn't it  B.is that  C.is it  D.isn't that  16.I don't know _______makes her afraid of having her business discussed.  A.what it is about Mary that    B.that is it abut Mary what   C.what is it about Mary that    D.that is about Mary what  17. .It was with great joy _______he received the news that his long lost son would return home  A.as  B.that  C.so  D.for  18.I don't think _____difficult for a Chinese student to master a foreign language within five years  A.that  B.it  C.too  D.very  19.It's the second time you _______late this week.  A.arrive  B.arrived  C.have arrived  D.had arrived  20.It will not be _______we meet again.  A.long before  B.before long   C.soon after  D.shortly after  21.It's demanded that we _______there on foot.  A.not to go   B.don't go    C.not go     D.won't go  22.“It” is often used to _______a baby.  A.mean to  B.stick to  C.point to  D.refer to  23.It was not until 1936 _______ basketball became a regular part of the Olympic Games.  A.that  B.when  C.which  D.then  24. _______you met the Englishman?  A.Where it was that B.Who it was that  C.Where was it that  D.Where was that  25._______that she has gone to the United States?  A.Was it true  B.Is it true  C.It is true D.It was true  26. _______certain that his invention will lead to the development of production.  A.That's  B.This is  C.It's  D.What's  27. _______in 1914 _______the First World War broke out?  A.Was that, that  B.Was that, when  C.Was it. that   D.Was it, when  28.It is important that she _______with Mr Williams immediately.  A.speak  B.spoke  C.will speak  D.to speak  29._______that there′s another good harvest this year.  A.It says  B.It is said  D.It was said  D.He was said  30.It is the first time _______the play.  A.I've watched  B.I'll watch  C.I watch  D.I would watch 

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