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
A．officiallyB．usuallyC．generallyD．seasonally
A．officially
B．usually
C．generally
D．seasonally
单项选择题
A．receiveB．retrieveC．acceptD．adopt
A．receive
B．retrieve
C．accept
D．adopt
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