【題目】The air pollution is so terrible. It will be worse ____ we do something to protect the environment.

A. ifB. when

C. unlessD. since

【答案】C

【解析】

考查連接詞。句意:空氣污染太嚴(yán)重。除非我們采取保護(hù)措施,否則環(huán)境將變得更糟。A. if 表示“假設(shè)”、“如果”,可引導(dǎo)條件狀語(yǔ)從句;B. when 表示“當(dāng)… 時(shí)候”,引導(dǎo)時(shí)間狀語(yǔ)從句;C. unless 表示除非否則…”D. since 作連詞時(shí),表示因?yàn)?/span>、既然,引導(dǎo)原因狀語(yǔ)從句。根據(jù)句意可知選C。

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