______ there are living creatures in the outer space as those on Earth hasn’t been proved so far.A．WhenB．HowC．IfD．Whether-高中英语-n多题

◎ 题干

______ there are living creatures in the outer space as those on Earth hasn’t been proved so far.

A．When

B．How

C．If

D．Whether

◎ 答案

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◎ 解析

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◎ 知识点

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