单项选择题

It is an irrevocable letter of credit which can not ( ).

A．change
B．be changed
C．changing
D．changed
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单项选择题
C．O．means( )Of origin
A．certificate
B．currency
C．container
D．catalogue
单项选择题
Please ( )me the Customs Declaration form.
A．shows
B．show
C．showing
D．showing
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