单项选择题

I'm a bit tied-up at the moment. I ______ be able to see you later but I'm not sure yet.

A．must
B．can't
C．have to
D．might
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单项选择题
The boy was allowed to leave at 10 am, and so ______ the girl.
A．did
B．would
C．was
D．will
单项选择题
If only I had known about your difficult situation, I ______.
A．would help you
B．will help you
C．will have helped you
D．would have helped you
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