单项选择题

The introduction of containers in transport greatly ______ carriage of goods.

A．facilitate
B．speeds
C．facilitates
D．economizes
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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
B L is the abbreviation for ______.
A．letter of credit
B．buying contract
C．commercial invoice
D．bill of lading
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