Edward you play so well. But I you played the piano.A. didn’t know B. hadn’t know C. don’

问题补充：

Edward, you play so well. But I you played the piano.

A. didn’t know

B. hadn’t know

C. don’t know

D. haven’t known

答案：

A. didn’t know

B. hadn’t know

C. don’t know

D. haven’t known

解析：考察时态。根据句意可知我不知道你弹钢琴是过去不知道，现在已经知道了，故使用过去时。