Luggage may not be brought into the building a guard has checked it first.A. when B. becauseC. 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：条件状语从句。这是一个条件状语从句，从句是主句的条件，在选项中只有unless能引导条件状语从句。Unless在这里是除非的意思。该句意思为：行李箱可能不会被带进这个大厦，除非保安先检查了它。

考点：unless引导的条件状语从句。

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