◎ 题干
Jack wasn't saying anything, but the teacher smiled at him ________ he had done something very clever.
[     ]
A. as if  
B. in case
C. while  
D. though
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Jack wasn't saying anything, but the teacher smiled at him ________ he had done something very clever.[ ]A. as ifB. in caseC. whileD. though…”主要考查了你对  【从属连词】  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。