6. 【2019 • 甘肃省武威市】Lily practices playing _____________ piano after school every day.
A. a B. an C. / D. the
【答案】D
【解析】句意：每天放学后，李莉练习弹钢琴本题考查冠词辨析。西洋乐器前要加the，play the piano弹钢琴，故选D。