格林太太正在忙着练琴用英文怎么写 mrs green is busy ____ ____ ____ piano
问题描述：
格林太太正在忙着练琴用英文怎么写 mrs green is busy ____ ____ ____ piano
答
practicing playing the
这道题出得非常好,因为有三个考点.
考点一：be busy doing
考点二：practicing doing
考点三：乐器前要加定冠词the