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    精英家教网 > 高中英语 > 题目详情
    Scientists overcame (克服) much difficulty they had _____ that technological problem _____ they finally
    could send the manned (载人的) spaceship up into space.

    A. to solve; until
    B. solving; before
    C. to solve; before
    D. solving; until
    B
    请在这里输入关键词：
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    科目：高中英语 来源：期中题 题型：单选题

    Scientists overcame (克服) much difficulty they had _____ that technological problem _____ they finally
    could send the manned (载人的) spaceship up into space.
    [     ]
    A. to solve; until
    B. solving; before
    C. to solve; before
    D. solving; until

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