Edward you play so well. But I you played the piano.A. didn’t knowB. hadn’t knownC. don

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：句意为：爱德华,你打得好。但我不知道你弹钢琴。所谈论的是指过去行为，故用过去式。