Every year millions of people visit Hangzhou

问题补充：

Every year,millions of people visit Hangzhou,

答案：

D.known

定语从句省略了“which is”

完整的句子其实就是Every year,millions of people visit Hangzhou,which is known for the West Lake.

======以下答案可供参考======

供参考答案1:

D.known

供参考答案2:

选D 非限制性定语从句省略了which is

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