【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】

試題句意:空氣污染很嚴重。 情況將會更加嚴重,除非我們采取措施來保護環(huán)境。A. if如果; B. unless除非,如果不;C. until直到……才;D. when……的時候。句意和詞意結(jié)合可知,選B。

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