单项选择题

I ______ housework when there was a knock at the door.

A．did
B．was doing
C．am doing
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单项选择题
My wife often forgets ______ the door, but she remembered ______ it when she left yesterday.
A．closing; close
B．closing; to close
C．to close; closing
单项选择题
He is pleased ______ the gift.
A．for
B．with
C．at
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