单项选择题

They got some valuable ______ from the night watchman.

A．informations
B．piece of information
C．information
D．pieces of informations
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单项选择题
Neither the President nor the Vice President ______ signed the document.
A．has
B．have
C．is
D．are
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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