Luggage may not be brought into the building a guard has checked it first.A. when B. because C. after D. unless 题目和参考答案——青夏教育精英家教网—

题目内容

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

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

【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

考点：考察条件状语从句引导词。

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