单项选择题

China has ______ for over 20 years.

A．develop
B．developed
C．developing
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单项选择题
— Can I speak to Mr. Liu. Please — Sorry but he's busy ______ his guests now.
A．to meet
B．with
C．meeting
单项选择题
— Who can tell me the answer ______ this question
A．about
B．of
C．to
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