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

A.ifB.untilC.unlessD.since

【答案】C

【解析】

句意:除非我们更加努力学习,否则我们跟不上发展的形势。

考查连词的用法。if如果;until直到;unless除非,如果不;since自从,因为。根据句意表示如果不更努力,就跟不上发展的形势,条件状语从句中表示如果不,用unless。故选C

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