单项选择题

Language learning is a slow process, which ______ a lot of effort, time and patience.

A． requires
B． leaves
C． pays
D．offers
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单项选择题
Your sales methods will depend ______ the customers with whom you deal.

A．with
B．on
C．in
D．for
单项选择题
In recent years, there have been over 30 foreign companies ______ business in this city.
A．doing
B．do
C．to do
D． done
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