【題目】—The air pollution is terrible.
— It will be worse we take action to protect the environment.
A.if
B.unless
C.so
D.though

【答案】B
【解析】句意:--空氣污染是糟糕的。--除非我們采取行動保護環(huán)境否則會更糟糕。A. if如果;B. unless 除非,如果不;C. so 所以;D. though 盡管。根據(jù)句意,故選B。

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