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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。---如果我们不采取行动保护环境,它会更糟糕。A. if如果;B. unless除非,如果不;C. until直到……时;D. when当……时候。所以选B。

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