问题
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
答案
参考答案：A
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It is impossible for us to extend this Letter of Credit, which expires ______ December 30.
A．on
B．in
C．at
D．for
参考答案：A