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

答案A A.根据句意可知,说话者是“过去”不知道,现在已经知道了,因此句子用一般过去时.句意为：爱德华,你弹得太好了.但我之前不知道你会弹钢琴.又如：Hello!I didn’t know you were in London.How long have you been here?我之前不知道你在伦敦.你在这里多久了?查看原帖