It was not until the beginning of the twentieth century________to explore space. A．did man begin B．w...
2023-01-13 00:11:42 151次 2011-2012学年福建省高三上学期期中考试英语题 单项填空 反馈错误 加入收藏 正确率 : 100%
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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