单项选择题

It is ( ) irrevocable letter of credit which can not be changed

A. a
B. an
C. the
D. /
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单项选择题
Not until yesterday ( ) your payment.
A. have we received
B. had we received
C. did we receive
D. we have received
单项选择题
汉译英：“货物、商品、展示”。( )
A. goods; good; display
B. commodity; goods; exhibit
C. goods; commodity; exhibit
D. goods; commodity; display
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