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(yǔ)從句引導(dǎo)詞。A. When當(dāng)… 引導(dǎo)時(shí)間狀語(yǔ)從句；B. Because因?yàn)?引導(dǎo)原因狀語(yǔ)從句；C. after 在…之后D. Unless除非 引導(dǎo)條件狀語(yǔ)從句。該句意思為：除非保安檢查過(guò)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(gè)條件狀語(yǔ)從句，根據(jù)句意故選D

考點(diǎn)：考察條件狀語(yǔ)從句引導(dǎo)詞。

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