单项选择题
A.free
B.unneeded
C.unemployed
D.busy
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单项选择题
A.inB.toC.forD.at
A.in
B.to
C.for
D.at
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单项选择题
A.ButB.SoC.ThereforeD.Then
A.But
B.So
C.Therefore
D.Then
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