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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
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科目:初中英语 来源:0113 月考题 题型:单选题

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

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