单项选择题

It was very kind of him ______ the door for us.

[A] for opening
[B] and open
[C] to open
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单项选择题
When I opened the door, I found a dog ______ in the snow.
[A] lie
[B] lying
[C] lay
单项选择题
I just don't enjoy ______ in this classroom; it is so crowded.
[A] sitting
[B] to sit
[C] sit
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