单项选择题

I've looked for my pen everywhere, but I ______ find it.

A．couldn't
B．can't
C．mustn't
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She ran across the street because she ______ her brother on the other side.
A．met
B．knew
C．saw
单项选择题
There is nobody in the office ______ there
A．isn't
B．aren't
C．is
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