To those scientists, it still remains to be a question man can go back to the old days wi

发布时间：2020-08-16 12:16:38


To those scientists, it still remains to be a question      man can go back to the old days with time machine.
A. if
B. that
C. how
D. whether

网友回答

A. if
B. that
C. how
D. whether
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