问题
单项选择题
______ your part, you must urge your customers to open the L/C without delay.
A．At
B．In
C．For
D．On
答案
参考答案：D
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______ your part, you must urge your customers to open the L/C without delay.
A．At
B．In
C．For
D．On
参考答案：D