He smiled politely ________ Mary apologized for her drunken friends. (2012·山東，27)
A．a(chǎn)sB．if
C．unlessD．though
A
解析　句意為：當瑪麗因她醉酒的朋友向他道歉時，他禮貌地微笑著。if如果，引導條件狀語從句；unless除非，引導條件狀語從句；though雖然，盡管，引導讓步狀語從句。as可引導時間狀語從句，表示主從句動作同時發(fā)生或前后緊接著發(fā)生，常常譯為“(正當)……的時候，隨著……，一邊……一邊……”，故只有as符合題意。
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