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

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

    【答案】D

    【解析】

    试题分析：考察条件状语从句引导词。A. When当… 引导时间状语从句；B. Because因为 引导原因状语从句；C. after 在…之后D. Unless除非 引导条件状语从句。该句意思为：除非保安检查过行李，否则不能带入这栋建筑物。保安检查行李是条件，所以这是个条件状语从句，根据句意故选D

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