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
We regret to say that the prices you have bid are too low to ______.
A．accept
B．be acceptable
C．be accepting
D．be unacceptable
单项选择题
Our offer remains open ______ 3 days.
A．at
B．for
C．in
D．on
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