单项选择题

A.at
B.to
C.with
D.about
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单项选择题
A.instructiveB.efficientC.beneficialD.profitable
A.instructive
B.efficient
C.beneficial
D.profitable
单项选择题
A.recentlyB.alreadyC.firmlyD.long
A.recently
B.already
C.firmly
D.long
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