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
B L is the abbreviation for ______.
A．letter of credit
B．buying contract
C．commercial invoice
D．bill of lading
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
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