单项选择题

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

A．
[A] did

B．
[B] was doing

C．
[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．
[A] closing; close

B．
[B] closing; to close

C．
[C] to close; closing
单项选择题
The elephant is ______ big that it can' t get into the room.
A．
[A] so

B．
[B] such

C．
[C] very
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