Luggage may not be brought into the buil...

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：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。

考点分析：

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