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

試題分析：考查連詞：句意：請不要打電話到我的辦公室，除非是真的有必要。 A．if如果，引導(dǎo)條件狀語從句，B．unless除非，引導(dǎo)條件狀語從句，C．otherwise副詞，否則，D．except介詞“除了”，選B。
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