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    精英家教网 > 高中英语 > 题目详情
    It was not until the beginning of the twentieth century________to explore space.
    A．did man beginB．when man began
    C．that man beganD．then man began
    C
    考查not until的强调句型。结构为：it is + not until+其它+that … ,故选C，句意为：就是直到二十世纪开始的时候人类开始探索太空。
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