单项选择题

I'm sorry ______ answered your letter earlier.

A．having not
B．not having
C．not to have
D．to not have
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单项选择题
The alarm clock didn't ring this morning. I ______ it last night.
A．did forgotten to wind
B．may have forgotten winding
C．ought to have forgotten to wind
D．must have forgotten to wind
单项选择题
We could do nothing but ______ till he came back.
A．to wait
B．waiting
C．wait
D．waited
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