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题目内容
We will have no water to drink _________ we don’t protect the earth.
A. until B. if C. unless
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相关练习册答案
B
试题分析:A. until直到,B. if如果,C. unless除非,句意:如果我们不保护地球,我们将没有水喝。if引导的条件状语从句用一般现在时,主句用一般将来时。故选B。
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