单项选择题

______ we need air and water, we need criticism and self criticism.

A．Even though
B．So long as
C．Just as
D．Now that
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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
单项选择题
China is one 0f the ______ countries．
A．develop
B．developed
C．developing
D．development
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