What is lily doing now ？she is playing the piano。这个句子问的是妮妮现在正在干什么？她正在弹钢琴。根据句意知道要用进行时
句型的提示词now说明是现在进行时。所以填：What is Lily doing now？She is playing the piano。勤学好问 天天进步！
