Itisrequiredthatstudents_____mobilephonesatschool,soseldom_____themusingone.
A.don’t use; will you seeB.should not use; you will seeC.not use; will you seeD.can’t use; will you see在线课程C
解析：
第一空填not use是虚拟语气的用法：句型It‘s required that从句中用（should）+动词原形，第二空是倒装句的用法，seldom“很少”置于句首时，句子用部分倒装，will放在主语前面。选C。