◎ 题干
He smiled politely ________ Mary apologized for her drunken friends.
[     ]
A. as
B. if
C. unless
D. though
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“He smiled politely ________Mary apologized for her drunken friends. [ ]A. as B. ifC. unless D. though…”主要考查了你对  【从属连词】【状语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。