单项选择题

Nowhere ______ so many people planting trees.

A．have we seen
B．we have seen
C．have seen we
D．we saw
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单项选择题
China is one 0f the ______ countries．
A．develop
B．developed
C．developing
D．development
单项选择题
I enjoy playing basketball and then ______.
A．taking a bath
B．to take a bath
C．take a bath
D．took a bath
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