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

A.ifB.unlessC.as ifD.except

【答案】B

【解析】

考查條件狀語從句。句意：除非真的有必要，否則請不要給我辦公室打電話。A. if如果；B. unless除非；C. as if好像；D. except除……之外。表示“除非”，故選B。

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