单项选择题

B/L is the abbreviation for______

A．letter of credit
B．buying contract
C．commercial invoice
D．bill of lading
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单项选择题
Melbourne is one of the port cities of ______.
A. Canada
B. U.S.A.
C. Australia
D. New Zealand
单项选择题
We understand you have over 20 years' experience ______ this particular line of business.
A．with
B．of
C．in
D．on
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