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信息发布者：
C

B

B

B

Qian Xuesen is a pioneer in the science and and technology 
field. He is respected by people.
It's really patient of Mr Wang to repeat grammar rules for us.
Jenny always keeps everything in order.
China's high-speed rail technology takes the lead in the world.
an
order
impatient
suitable
as
to be
activities
to take
twice
it
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