单项选择题

I was almost asleep last night when I suddenly heard someone ______ at the door.

A．be knocking
B．knocking
C．to knock
D．having knocked
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单项选择题
This problem is ______ his ability and 1 don't think he can solve it.
A．to
B．in
C．beyond
D．under
单项选择题
She didn't go to the party last night, ______ she had to finish her term paper.
A．if
B．though
C．till
D．because
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