【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：句意為：---空氣污染太可怕了。---如果我們不采取措施保護環(huán)境，將會更加糟糕。if：如果， unless：除非、如果不，until ：直到……才……，When：當……時候。根據(jù)語境可知應(yīng)選B。

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