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：考察條件狀語從句引導(dǎo)詞。A. When當(dāng)… 引導(dǎo)時間狀語從句；B. Because因為 引導(dǎo)原因狀語從句；C. after 在…之后D. Unless除非 引導(dǎo)條件狀語從句。該句意思為：除非保安檢查過行李，否則不能帶入這棟建筑物。保安檢查行李是條件，所以這是個條件狀語從句，根據(jù)句意故選D

考點：考察條件狀語從句引導(dǎo)詞。

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