Edward you play so well. But I you played the piano. A. didn’t knowB. hadn’t known C. do

问题补充：

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

A. didn’t know

B. hadn’t known

C. don’t know

D. haven’t known

答案：

(答案→)A. didn’t know

B. hadn’t known

C. don’t know

D. haven’t known

解析：前句说。Edward，你（钢琴）弹得这么好，可见现在已经知道“你弹钢琴”，不知道是在过去，而不是现在，因此句子用一般过去时。