It is required that the students mobile phones in their school, so seldom them using one.
A. should not use; you will see
B. don’t use; will you see
C. not use; will you see
D. not use; you will see
网友回答
A. should not use; you will see
B. don’t use; will you see
(答案→)C. not use; will you see
D. not use; you will see
解析：考查虚拟语气及倒装结构。Require要求，从句用should + v原形，should可以省略；否定词seldom放在句首，主句的主语与谓语发生倒装。选C。