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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