单项选择题

We are glad to receive your telegraphic order of May 6 ______ regret that we can- not supply the goods ______ the end of May.

A．but, by
B．and, by
C．but, for
D．and, for
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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
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
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