That piece of music sounds quite familiar. Who _____ the piano upstairs?
A.has playedB.playedC.playsD.is playing在线课程D
解析：
考查时态。句意：这段音乐听起来很熟悉。谁在楼上弹钢琴？可知下文描述的是正在发生的动作，故用现在进行时态，选A。