【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:—空氣污染很嚴(yán)重。 —情況將會(huì)更加嚴(yán)重,除非我們采取措施來(lái)保護(hù)環(huán)境。A. if如果; B. unless除非,如果不;C. until直到……才;D. when當(dāng)……的時(shí)候。句意和詞意結(jié)合可知,選B。

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