【題目】________ you make an appointment (約定) 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:除非你提前跟經(jīng)理約好了,否則你現(xiàn)在不可能見到他的。

考查連詞辨析。When當(dāng)……時(shí)候;Unless除非;Since自從;If如果。由句意可知前句是后句的先決條件,用if語句不通,所以需要用unless引導(dǎo)條件狀語從句。故選B

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