It is required that students mobile phones at school, so seldom them using one.
A. don’t use; will you see
B. should not use; you will see
C. not use; will you see
D. can’t use; will you see
网友回答
A. don’t use; will you see
B. should not use; you will see
(答案→)C. not use; will you see
D. can’t use; will you see
解析：句意：学生们被要求在学校不能用手机，所以你很少看见他们用手机。
第一空require 所引导从句要用虚拟语气，should+do. Should 可省略。
第二空seldom 很少，否定副词置句首部分倒装。故选C。