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 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
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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