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

发布时间：2020-08-17 10:03:23

     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
解析：D 考察主语。句意：在外部空间是否有与地球相同的生物直到现在还没有得到证明。Whether引导主语从句，意为是否。
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