单项选择题

It's my great honor ______ to give a speech at the opening ceremony.

A．to invite
B．inviting
C．having invited
D．to be invited

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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

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

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