单项选择题
A.on
B.by
C.at
D.against
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单项选择题
A.inB.onC.atD.to
A.in
B.on
C.at
D.to
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单项选择题
A.to buyB.buyingC.having boughtD.from buying
A.to buy
B.buying
C.having bought
D.from buying
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