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    精英家教网 > 初中英语 > 题目详情
    We will have no water to drink _________ we don’t protect the earth.
    A. until                    B. if                       C. unless
    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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