单项选择题

It is impossible for us to extend this Letter of Credit, which expires （） December 30.

A. on
B. in
C. at
D. for

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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
对于加工贸易合同核销，经营企业应当自加工贸易手册项下最后一批成品出口或者加工贸易手册到期之日起______日内向海关报核。
A．10
B．15
C．30
D．20
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