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】

試題分析：條件狀語(yǔ)從句。這是一個(gè)條件狀語(yǔ)從句，從句是主句的條件，在選項(xiàng)中只有unless能引導(dǎo)條件狀語(yǔ)從句。Unless在這里是除非的意思。該句意思為：行李箱可能不會(huì)被帶進(jìn)這個(gè)大廈，除非保安先檢查了它。

考點(diǎn)：unless引導(dǎo)的條件狀語(yǔ)從句。

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