单项选择题

Our offer remains open ______ 3 days.

A．at
B．for
C．in
D．on
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单项选择题
Regulations of Customs duties on Imports and Exports of the People's Republic of China is one of the ______ basis of the collection of the Customs duty.
A．legal
B．finacial
C．managerial
D．none of the above
单项选择题
We have lodged a claim ______ the seller for the shortage of shipment ______ S. S. DONGFENG.
A．against, ex
B．with, under
C．on, as per
D．with, to
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