The girl was seenthe piano at 4.00 yesterday afternoon.A. to playB. playC. playingD. playe

问题补充：

The girl was seenthe piano at 4.00 yesterday afternoon.

A. to play

B. play

C. playing

D. played

答案：

A. to play

B. play

(答案→)C. playing

D. played

解析：句意；昨天下午四点，有人看见这个女孩正在弹钢琴。现在分词作宾语补足语表示正在进行的伴随性动作，结合语境可知选C。