Tom,you play so well.But l [] you played the piano中间添didnot know还是havenot known 为什么呀

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Tom,you play so well.But l [] you played the piano中间添didnot know还是havenot known 为什么呀
Tom,you play so well.But l [] you played the piano
中间添didnot know还是havenot known 为什么呀

Tom,you play so well.But l [] you played the piano中间添didnot know还是havenot known 为什么呀
did not know 因为说句话之前是“不知道的”,因此用过去时;说这句话的时候其实已经知道了.