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Luggage may not be brought into the building ________ a guard has checked it first.

A. when B. because C. after D. unless

D

【解析】

试题分析:考查状语从句。A. when 当---时候;B. because 因为;C. after在---之后;D. unless除非。句意:行李不可能被带进大楼,除非一个哨兵首先检查了它。故选D。

考点:考查状语从句。

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