I ______(not know) you _______(be)so busy in the past few years.怎么填

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I ______(not know) you _______(be)so busy in the past few years.怎么填
I ______(not know) you _______(be)so busy in the past few years.怎么填

I ______(not know) you _______(be)so busy in the past few years.怎么填
I did not know you were so busy...

didn't know had been

don't know being
因为know很明显是句子的谓语,所以后面的be就不能用原型,只能是用现在分词作状语