there are living creatures in the outer space as those on Earth hasn’t been proved until

发布时间：2020-08-16 06:44:44

     there are living creatures in the outer space as those on Earth hasn’t been proved until now.
A. How
B. When
C. Where
D. Whether

网友回答

A. How
B. When
C. Where
(答案→)D. Whether
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