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    【题目】Please don’t call me at the office ________ it’s really necessary.

    A.ifB.unlessC.as ifD.except

    【答案】B

    【解析】

    考查条件状语从句。句意：除非真的有必要，否则请不要给我办公室打电话。A. if如果；B. unless除非；C. as if好像；D. except除……之外。表示“除非”，故选B。

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