问题
选择题
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
答案
答案：C
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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
答案：C