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：考查狀語從句。A. when 當(dāng)---時(shí)候；B. because 因?yàn)椋籆. after在---之后；D. unless除非。句意：行李不可能被帶進(jìn)大樓，除非一個(gè)哨兵首先檢查了它。故選D。

考點(diǎn)：考查狀語從句。

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