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．financial
C．managerial
D．none of the above
单项选择题
The Customs will not ______ the restricted goods unless an import or export license is obtained.
A．clear
B．release
C．sell
D．buy
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