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
In the foreign trade business, the trade terms CFR is often used. CFR is the abbreviation for ______.
A．Commercial Invoice
B．Cost, insurance and freight
C．Cost and freight
D．Carriage paid to
单项选择题
On careful examination of your samples, we found that the cotton piece goods are well ______ standard in quality.
A．until
B．up to
C．in
D．into
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