单项选择题

We understand you have over 20 years' experience ______ this particular line of business.

A．with
B．of
C．in
D．on
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单项选择题
Colombo is one of the port cities of ______.
A．Sir Lanka
B．India
C．Malaysia
D．Iran
单项选择题
The seller should guarantee that the commodities comply ______ the quality, specification and preformance as stipulated in the contract.
A．for
B．in
C．to
D．with
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