tom,you played so well .but,i ____ you played the paino.

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tom,you played so well .but,i ____ you played the paino.
A did not know B had not known
it is well known和 what is well known 和as is well known的用法和区别
不要百度百科!

B 考点：过去完成时,要点要找到过去的一个点,过去完成时的意思是过去的过去.就是说you played so well 这是过去的一个点,在这个点之前我还不知道,用B
It is well known+that
what is well known+is（that）
as is well known ,+完整句子
例
It is well known+that Tom is handsome
what is well known+is（that）Tom is handsome
as is well known ,Tom is handsome

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