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【题目】—The air pollution is terrible.

It will be worse ________ we take action to protect the environment.

A. if B. unless C. until D. When

【答案】B

【解析】

试题分析:句意:—空气污染很严重。 —情况将会更加严重,除非我们采取措施来保护环境。A. if如果; B. unless除非,如果不;C. until直到……才;D. when当……的时候。句意和词意结合可知,选B。

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