It was not until the beginning of the twentieth century to explore space. A．did man begin B．when man began C．that man began D．then man began 题目和参考答案——青夏教育精英家教网—

题目内容

It was not until the beginning of the twentieth century________to explore space.

A．did man begin B．when man began

C．that man began D．then man began

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【解析】略

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