As a student,you ____ spend so much time playing computer games,which isa waste of time.
问题描述：
As a student,you ____ spend so much time playing computer games,which isa waste of time.
A.may not B.mustn’t C.needn’t D.won’t
答
B.mustn’t
A可以不 B不能、不应该（表示“禁止/不允许”） C不需要
作为一个学生,你不能在电脑游戏上花太多时间,这是浪费时间.