One of the students good at piano.A. are playing theB. is play theC. are playingD. is

问题补充：

One of the students good at piano.

A. are, playing the

B. is, play the

C. are, playing

D. is, playing the

答案：

A. are, playing the

B. is, play the

C. are, playing

(答案→)D. is, playing the

解析：句意：一名学生擅长弹钢琴。第一空One of the students作主语，表示一名学生，故谓语用单数形式is。第二空be good at+doing sth. 擅长做某事，play the piano 弹钢琴， 乐器前加定冠词the，故选D。