单项选择题

Neither the President nor the Vice President ______ signed the document.

A．has
B．have
C．is
D．are
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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
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
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