单项选择题

Children tend to rely on ______ school friends to keep in touch with schoolwork.

A．concern
B．concerning
C．concerned
D．to concern
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单项选择题
He ______ the bully in the chest, sending him knocking against the wall.
A．punched
B．slapped
C．tapped
D．stroke
单项选择题
Joan has all the packages ______ and posted to Mr. Smith.
A．done up
B．done with
C．done out
D．done over
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