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 look forward to ______ the goods in the fourth quarter.
A．the delivery of
B．your delivery
C．deliver
D．delivery
单项选择题
Our offer remains open ______ 3 days.
A．at
B．for
C．in
D．on
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