◎ 题干
The old man sat in front of the television every evening, happy ________ anything that happened to be on.
[    ]
A. to watch  
B. watching
C. watched  
D. to have watched
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“The old man sat in front of the television every evening, happy ________ anything that happened to be on.[ ]A. to watch B. watchingC. watchedD. to have watc…”主要考查了你对  【不定式】  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。