◎ 题干
The old man              in front of the door, waiting for his children to come back home.
[     ]
A.was used to sit
B.is used to sit
C.used to sit
D.used to sitting
◎ 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 manin front of the door, waiting for his children to come back home.[ ]A.was used to sit B.is used to sit C.used to sitD.used to sitting …”主要考查了你对  【动词短语】  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。