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- The air pollution is terrible.

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

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

B

【解析】

試題分析：句意：---空氣污染很嚴(yán)重。---如果我們不采取行動(dòng)保護(hù)環(huán)境，它會(huì)更糟糕。A. if如果；B. unless除非，如果不；C. until直到……時(shí)；D. when當(dāng)……時(shí)候。所以選B。

考點(diǎn)：考查連詞的用法。

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