4. 选A。 只要将题干还原成陈述句，便可发现这是一个强调结构，即答案应在A、B之间，根据句子结构和意义较易排除B。　

3. 选A。 将题干还原成陈述句后可知，that充当主语，先行词all以及后面的定语从句作表语。

2. 选B。 因助动词did后须接动词原形，首先可将C、D排除；再将题干还原成陈述句，这时可发现句中有 “have+复合宾语”这一结构，而the teacher 与write之间系主谓关系，故A也应排除。

1. A。乍看题干，很可能会有学生将this factory当作先行词而误选B或C，但若将题干还原成陈述句，便会清楚地发现句中缺少表语，四个选项中唯有A项可以当表语。

4. 当遇到not …until…这一句型变成强调句型时，一定要用：It is(was)not until…that…. 例句：

A． It ws not until yesterday that I knew he ws coming. (I didn’t know he was coming until yesterday.)

B. It was not until I grew up that he told me all about it. (He didn’t tell me anything about it until I grew up.)

C. It is not until six o’clock that he will go to school. (He wont’ go to school until six o’clock.)　

答案及简析：

3. 在否定句中，如果表示强调，多在句尾加at all. 例如：

A． I know nothing about it at all.

B.　 He didn’t do his homework at all.

2. 强调用法，只用于肯定句中，用do, does 或did加动词原形。

A． Do be here on time. (千万要准时来呀。)

B． The family did send him to school.

C.　 He does know all about it.

1. 英语中表示强调的有强调句型It is…, that…; It was…that….

强调句型只有两个时态，即 It is 和It was, 后跟被强调部分，然后用 that….

被强调的是句子的主语，宾语和状语。状语可以是副词，介词短语或从句。如果被强调的是人，可以用who. 例句：

A．It was in the morning that he often went to see his friend.

B. It is I who am your close comrade-in-arms.

C. What is it that you want me to do?

36. Did_________ on time make her teacher angry?

A. not to come　　　　　 B. her not to come

C. her not coming　　　 D. not her coming

[附] 强调

35. The boy I considered________ cheated in the exam.

A. being honest　　　　　 B. to be honest

C. was honest　　　　　　 D. that is honest