单项选择题

They left three hours ago; they ______ there by now.

A．must arrive
B．can arrive
C．must have arrived
D．will arrive
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单项选择题
I have no objection ______ his staying in the library as long as he keeps quiet.
A．of
B．to
C．in
D．over
单项选择题
All the class burst ______ laughter when they saw the funny picture.
A．in
B．at
C．on
D．into
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