问题补充:
---- Dad , why should I stop computer games ?
----- For your health , my boy , I’m afraid you .
A. to play; must
B. playing; have to
C. to play ; can
D. playing ; may
答案:
A. to play; must
(答案→)B. playing; have to
C. to play ; can
D. playing ; may
解析:must必须,一定;have to必须,不得不;can 能,能够;may可以,可能。句意:爸爸,为什么我必须停止玩电脑游戏?——为了你的健康,我的孩子,恐怕你必须得停止了。Stop后接不定式表示停下来去做另一件事,接动名词表示停止正在做的动作,结合语境可知选B。