It’s harmful for the students to spend too much of their time computer games.A. playB. t

问题补充：

It’s harmful for the students to spend too much of their time computer games.

A. play

B. to play

C. playing

D. played

答案：

A. play

B. to play

(答案→)C. playing

D. played

解析：考查非谓语动词。句意：他们花太多时间玩电脑游戏是对学生们有害的。现在分词表示正在进行的伴随性动作，和句子主语是主谓关系，故选C。