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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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