there are living creatures in the outer space as those on Earth hasn't been proved until now.A．How B．WhenC．Where D．Whether 题目和参考答案——青夏教育精英家教网—

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________ 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

【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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