【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】本題考查連詞的用法。答句句意為“如果我們不采取行動(dòng)，空氣污染將會(huì)更嚴(yán)重”，由此可知所缺的詞是unless。

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