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
Pre-entry refers to the （） of Customs entry documents for an export consignment before it actually leave the country.

A. report
B. submission
C. issue
D. order
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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