【題目】We can’t keep up with the developing situation _______ we study harder .

A.ifB.untilC.unlessD.since

【答案】C

【解析】

句意:除非我們更加努力學(xué)習(xí),否則我們跟不上發(fā)展的形勢。

考查連詞的用法。if如果;until直到;unless除非,如果不;since自從,因為。根據(jù)句意表示如果不更努力,就跟不上發(fā)展的形勢,條件狀語從句中表示如果不,用unless。故選C

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