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
The European Community says it will consider using force ______ is needed for peace keeping in the region.
A．what
B．that
C．such
D．so
单项选择题
When confronted with these math problems, her mind tended to go ______ and could hardly work any more.
A．blank
B．faint
C．dim
D．vain
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