- The air pollution is terrible.- It will be worse we take action to protect the environment.A. if B. unless C. until D. when 题目和参考答案——青夏教育精英家教网—

题目内容

- The air pollution is terrible.

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

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

【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。

考点：考查连词的用法。

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