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)---時候；B. because 因為；C. after在---之后；D. unless除非。句意：行李不可能被帶進大樓，除非一個哨兵首先檢查了它。故選D。

考點：考查狀語從句。

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