It’srequiredthatthestudents___mobilephonesintheirschool,soseldom____themusingone.
A.not use; will you seeB.should not use; you will seeC.don’t use; will you seeD.would not use; you will see在线课程A
第一个空考查It’s required that (should)do，第二个空考查seldom放在句首使用部分倒装。所以选A。