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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】

试题分析:after在……之后;before在……之前;since自……以来;when当……时候。

句意:钱学森在他发现航天技术之前,他尝试了许多次。

考点:考查连词的用法。

点评:本试题难度适中。判断从句中用哪个连词,需用记住连词的用法,在句中的作用,连词也是高考的热点,需要考生平时多练习。需要考生会分析句子成分理解句意。

即学即练:They stood respectfully ______he entered the room.

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

解析:D。句意:当他走进房间时,他们都恭恭敬敬地站着。

 

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.

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