一道英语选择题Amy,you played so well.But I __________ you played th

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一道英语选择题
Amy,you played so well.But I __________ you played the piano.
A.didn't know B.haven't known
Why not choose B ?
用汉语回答就行了。。谢谢
那这句话怎么改，我才能用haven't known or hadn't known呢？

艾米,你弹得这么好.但是我以前都不知道你会弹钢琴.
改成“Amy,you play so well.But I haven't known you play so well."前面一句什么时态,后面紧跟着变化.

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