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


    1. A.
      after
    2. B.
      before
    3. C.
      since
    4. D.
      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。
    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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