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的強調(diào)句型。結(jié)構(gòu)為：it is + not until+其它+that … ,故選C，句意為：就是直到二十世紀開始的時候人類開始探索太空。
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