单项选择题

______is well-known, the environment in China is badly in need of improvement.

A．It
B．That
C．As
D．What
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单项选择题
_________was once regarded as impossible has now become a reality.
A．What
B．That
C．Which
D．As
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It was not until dawn_________ their way out of the forest.
A．when they found
B．that they found
C．did they find
D．that they didn’t find
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