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
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
单项选择题
All disputes ______ or in the execution of this contract shall be amicably settled through negotiations.
A．with connection to
B．in connection with
C．by connection of
D．of connection for
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