So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there

◎ 题干

So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ______.

A. mustn’t be

B. may not be

C. can’t be

D. won’t be

◎ 答案

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◎ 解析

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◎ 知识点

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