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Qian Xuesen tried many times _________ he found the solution to the puzzle about space technology.
A.afterB.beforeC.sinceD.when
B

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。
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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