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
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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单项选择题
China is one 0f the ______ countries．
A．develop
B．developed
C．developing
D．development
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