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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.so
D.though

【答案】B
【解析】句意:--空气污染是糟糕的。--除非我们采取行动保护环境否则会更糟糕。A. if如果;B. unless 除非,如果不;C. so 所以;D. though 尽管。根据句意,故选B。

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