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

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

选项 A、It
B、That
C、As
D、What

答案 C

解析此题考查的是as引导的特殊定语从句。As is well known/As is known to all/As we all know众所周知。

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