【題目】—The haze will be a serious problem ____ we take action to solve it .

—Sure it is. I think everyone should do something for it.

A. since B. if C. until D. unless

【答案】D

【解析】

句意：——霧霾將是一個嚴重的問題，除非我們采取行動來解決它�！斎皇�。我認為每個人都應該為此做點什么�？疾檫B詞辨析題。A. since既然，表原因；B. if如果，表條件；C. until直到，表時間，多與not連用；D. unless除非，表條件。本句是條件狀語從句，根據(jù)句意語境，可知unless符合句意，故選D。

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