单项选择题

Since the redesign of the assembly line, the productivity ______.

A．is improved
B．is improving
C．improves
D．has been improved.
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______ he can quickly seize the chance of business.
A．Having been well informed
B．Having well informed
C．To be well informed
D．To have been well informed
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Is it in that factory ______ Red Flag cars are produced
A．which
B．that
C．when
D．as
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