【題目】The earth will become worse and worse ________ we do something to stop her from being polluted.

A. if B. even if C. when D. unless

【答案】D

【解析】

試題分析:句意:除非我們做一些事情來阻止它被污染,否則地球就會(huì)變得越來越糟糕。此題考查,A如果;B即使;C當(dāng)……時(shí)候;D如果不,除非。根據(jù)句意,應(yīng)選D。

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