单项选择题
A.free
B.unneeded
C.unemployed
D.busy
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单项选择题
A.youB.someoneC.perhapsD.maybe
A.you
B.someone
C.perhaps
D.maybe
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单项选择题
A.forB.byC.atD.from
A.for
B.by
C.at
D.from
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