题目内容

Please don't call me at the office        it's really necessary．
A．ifB．unlessC．otherwiseD．except
B

试题分析：考查连词：句意：请不要打电话到我的办公室，除非是真的有必要。 A．if如果，引导条件状语从句，B．unless除非，引导条件状语从句，C．otherwise副词，否则，D．except介词“除了”，选B。
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