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
試題分析：after在……之后；before在……之前；since自……以來；when當……時候。
句意：錢學(xué)森在他發(fā)現(xiàn)航天技術(shù)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(xué)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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