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- The air pollution is terrible.  
- It will be worse ________ we take action to protect the environment.
A.ifB.unlessC.untilD.when
B

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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