【題目】—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】

試題分析：句意：--空氣污染是嚴(yán)重的。--如果我們不采取行動(dòng)保護(hù)環(huán)境它將更嚴(yán)重。A. if 如果；B. unless 如果不；C. until 直到；D. when當(dāng)。結(jié)合句意，故選B。

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