you picked up the watch.可知选B。

【点评】考查强调句型，掌握其结构。

48．It wasn't until Monday night ______ we were told that Unit 5 would be excluded（排除）.

A. since

B. when

C. that

D. before

【答案】 C

【解析】【分析】句意：直到星期一晚上我们才被告诉第5单元被排除。此处是not...until

的强调句型，故答案为C。

【点评】考查强调句型。本题涉及not...until的强调句型的应用。

49．______ he will return to his native land.

A. It is long before that

B. It will be long before that

C. It won't be long before

D. It is before long that

【答案】 D

【解析】【分析】句意：不就以后他就会回到他的祖国了。本题强调的是时间状语before long不久以后；强调句型的基本结构为It is/was被强调成分that/who其它成分；其最大的

特点就是去掉it is/was…that/who…句子仍然成立。要注意强调句型能强调除谓语动词以为

的所有的句子成分。在考查的时候，经常会把强调句型和定语从句结合在一起考查，要注

意分析句子的成分。故D正确。

【点评】考查强调句型，掌握其结构：it is/was…that/who…。

50．It was the training ____________ he had as a teenager _________ made him such a good engineer.

A. that; that

B. what; that

C. that; who

D. that; which

【答案】 A

【解析】【分析】句意：句意：就是他在年轻的时候接受的训练使他成为一个这么好的工

程师。第一空填which/that，引导定语从句，修饰the training，在定语从句中作宾语，第

二空填that，使用了强调句，强调的是the training _____ he had as a young man，所以选A。

【点评】考查定语从句和强调句型，本题涉及which/that引导的限制性定语从句，掌握强

调句型的结构“It is+被强调部分+that+其它部分”。