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【题目】________ you make an appointment (约定) with the manager in advance, it’s impossible for you to meet him now.

A.WhenB.UnlessC.SinceD.If

【答案】B

【解析】

句意:除非你提前跟经理约好了,否则你现在不可能见到他的。

考查连词辨析。When当……时候;Unless除非;Since自从;If如果。由句意可知前句是后句的先决条件,用if语句不通,所以需要用unless引导条件状语从句。故选B

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