256.(10-11，浙江省杭州市西湖高级中学高二11月月考)Only after spending several nights working on the math problem ______ to wonder whether the problem was wrongly set.

A．had he begun　　 　 B．he began　 　　 C．did he begin 　 D．began he

255.(10-11，浙江省苍南中学高二上期中)　 Only when I left my parents ________ how much I loved them.

A. I realized　　 　 B. I have realized　 　　 C. had I realized　　　 D. did I realize

254.(10-11，四川省彭州中学高二9月月考)-What did your sister want to know, Mary?

-_______that I could finish reading the story.

A. It was　　　　 B. Where was it 　　 C. It was when　　　　　　　　　　 D. When it was

253.(10-11，四川省成都市实验中学高二上期中)It was in the lab _______was taken charge of by Professor Black ______they did the experiment.

A. that ,where B. which, that　 C. whom, that　 D. which, where

252.(10-11，四川省成都市实验中学高二上期中)I have been working there for 15 years, and never before __________ my boss so serious!

A. I found　　　　　　 B. I have found　　　 C. did I find　　　　　 D. have I found

251.(10-11，陕西省宝鸡中学高二上期中)　 It is what you do rather than what you say _______ matters.

A. that　　 　B. what　　　　 C. which　　　　 D. this

250.(10-11，陕西省宝鸡中学高二上期中)　 At the foot of the mountain, __________ .

A. a village lie　　 B. lies a village　 C. does a village lie　　 D. lying a village

249.(10-11，山西省忻州一中高二上期中)Not until she went back to her school _____ the surprising news.

　A. did she hear　 B. heard she　 C. she heard　　 D. she did hear

248.(10-11，山西省忻州一中高二上期中)---Have you got any particular plans for the coming holiday?

---Yes, _____, I’m going to visit some homes for the old in the city.

　 A. if ever　　 B. if busy　　 C. if anything　　 D. if possible

247.(10-11，山西省太原五中高二上期中)　 _____ environmental damage is done does it take many years for the ecosystem to recover.

A. Even if　 　　　B. While　 　　　C. Only if　 　　　D. Once