【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】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。
考查連詞的用法。

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