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
My suggestion yesterday was that a meeting ______ to discuss the matter.
A．should hold
B．must be held
C．would be held
D．be held
单项选择题
We were very disappointed at the ______ to our advertisement, and our products didn't sell well.
A．replies
B．response
C．answers
D．words
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