you play piano when you were young?A. Can / goodB. Could / wellC. Could the well

问题补充：

you play piano when you were young?

A. Can, /, good

B. Could, /, well

C. Could, the , well

D. Can, the, good

答案：

A. Can, /, good

B. Could, /, well

(答案→)C. Could, the , well

D. Can, the, good

解析：play表示“弹、拉、演奏”等意思，后接表示“乐器”的名词时，名词前须用冠词，；修饰olay应用副词 well（good是形容词），故选C。