【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:-空氣污染太糟糕了。-如果我們不采取行動(dòng)保護(hù)環(huán)境會(huì)更糟糕。if連詞,如果;unless連詞,除非;until連詞,直到;when連詞,當(dāng)……時(shí)候。根據(jù)句意可知是除非之意。所以選B。

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