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

题目简介

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

题目详情

________ there are living creatures in the outer space as those on Earth hasn't been proved until now.
A.HowB.When
C.Where D.Whether
题型:单选题难度:中档来源:不详

答案

D
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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