It is required that the students ______ mobile phones in our school, so seldom ______ them using one.A.can’t use; will you seeB.not use; will you seeC.mustn’t use; will you seeD.shouldn’t use; you will see
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B解析考查虚拟语气和倒装。It是形式主语,that the students ______ mobile phones in our school是主语从句,require后面的主语从句要用(should)+do的虚拟语气,所以排除A,C;seldom表否定意义,用于句首时,后面句子部分倒装,所以选B。