单项选择题

The population in China ______ reduced in recent years.

A．have been
B．has been
C．is
D．are
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单项选择题
______ he can quickly seize the chance of business.
A．Having been well informed
B．To be well informed
C．Having well informed
D．To have been well informed
单项选择题
Since the redesign of the assembly line, the productivity ______.
A．is improved
B．improves
C．is improving
D．has been improved.
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