单项选择题
A.to pay
B.paying
C.pay
D.to have paid
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单项选择题
A.extensionB.retentionC.attentionD.exertion
A.extension
B.retention
C.attention
D.exertion
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单项选择题
A.overB.outC.offD.for
A.over
B.out
C.off
D.for
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