He smiled politely ________ Mary apologized for her drunken friends.(2012·山東)
A．a(chǎn)sB．ifC．unlessD．though
A
考查時(shí)間狀語(yǔ)從句。句意：當(dāng)Mary為她醉酒的朋友而道歉的時(shí)候，他有禮貌地笑了笑。此處as引導(dǎo)時(shí)間狀語(yǔ)從句，表示“當(dāng)……的時(shí)候”。
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