题目内容

It is impossible for humans to live on the moon_______ there is no water_______ air there.

A. so; and B. because; and

C. if; or D. because; or

 

D

【解析】

试题分析：句意: 对于人类来说，居住在月球上是不可能的，因为既没有空气，也没有水。because 引导原因状语从句；or和，用于否定句中。据句意，故选D。

考点：考查连词。

 

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