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【题目】— Shall we begin our trip at once?

No. We won’t set off________our head teacher agrees.

A.ifB.whileC.unless

【答案】C

【解析】

句意:——我们可以马上开始我们的旅行吗?——不,除非我们的班主任同意,否则我们不会出发。

考查连词辨析。if如果,引导条件状语从句;是否,引导宾语从句;while当……时候,引导时间状语从句;unless除非,如果不,引导条件状语从句。根据句意可知,这里表示“如果班主任不同意,我们就不能……”,故选C

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