Pleasedon'tcallmeattheoffice________it'sreallynecessary.A.ifB.unl

发布时间:2020-08-04 16:13:35

Please don't call me at the office ________ it's really necessary.A.ifB.unlessC.unless ifD.except

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B解析句意:除非有必要,否则不要给我办公室打电话。unless除非……否则……。其他选项不合本题逻辑。
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