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Qian Xuesen tried many times _________ he found the solution to the puzzle about space technology.

A.after             B.before            C.since             D.when

 

【答案】

B

【解析】

試題分析:after在……之后;before在……之前;since自……以來;when當……時候。

句意:錢學森在他發現航天技術之前,他嘗試了許多次。

考點:考查連詞的用法。

點評:本試題難度適中。判斷從句中用哪個連詞,需用記住連詞的用法,在句中的作用,連詞也是高考的熱點,需要考生平時多練習。需要考生會分析句子成分理解句意。

即學即練:They stood respectfully ______he entered the room.

A. after           B. before          C. since        D. when

解析:D。句意:當他走進房間時,他們都恭恭敬敬地站著。

 

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