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Qian Xuesen tried many times _________ h...

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

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

 

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。
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