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【题目】Many people believe we will face serious problems ______we take action to change the way we live.

A. but B. though C. unless D. until

【答案】C

【解析】句意:许多人们相信我们应该面对严重的问题,如果我们不采取行动来改变我们的生活方式。A. but但是;B. though尽管;C. unless除非;D. until直到。这里是unless引导的条件状语从句。根据题意,故选C。

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