问题补充：
Mother asks me computer games before finishing my homework.
A. not play
B. to play
C. to not play
D. not to play
答案：
A. not play
B. to play
C. to not play
(答案→)D. not to play
解析：句意:妈妈要求我在写完家庭作业之前不能玩电脑游戏。ask 问，要求，它的句型是ask sb. to do sth.让某人做某事；这个句型的否定形式应该在动词原形的前面加not，意思是让某人不要去做某事。故选D。
