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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We support the view that poor management will ______ business failure.
A．break up
B．take in
C．lead to
D．put off'
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By the end of this year, they ______ a new program in Europe.
A．had started
B．start
C．are starting
D．will have started
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