It was not until the beginning of the twentieth century_______ to explore space. [ &...
Itwasnotuntilthebeginningofthetwentiethcentury_______toexplorespace.[]A.didmanbeginB....
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 展开
A. did man begin B. when man began C. that man began D. then man began 展开
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| C |
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