these days students in some schools { }not to use mobcic phones A ask B asked C are asked ...

问题描述:

these days students in some schools { }not to use mobcic phones A ask B asked C are asked ...
these days students in some schools { }not to use mobcic phones A ask B asked C are asked D were asked

C 被动
目前有些学校的学生被要求不准使用手机,一般现在时或现在完成时都行