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(dāng)瑪麗因她醉酒的朋友向他道歉時(shí)，他禮貌地微笑著。if如果，引導(dǎo)條件狀語(yǔ)從句；unless除非，引導(dǎo)條件狀語(yǔ)從句；though雖然，盡管，引導(dǎo)讓步狀語(yǔ)從句。as可引導(dǎo)時(shí)間狀語(yǔ)從句，表示主從句動(dòng)作同時(shí)發(fā)生或前后緊接著發(fā)生，常常譯為“(正當(dāng))……的時(shí)候，隨著……，一邊……一邊……”，故只有as符合題意。
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