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12 It's required that the students ____mobiles phones in thi

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12 It's required that the students ____mobiles phones in thire school,so seldom____them using one
A should not use; you will see
B mustn’t use ;will you see
C not use’; you will see
D not use,will you see
选哪个
选 B mustn’t use ;will you see
句首为否定或半否定的词语,如no,not,never,seldom,little,hardly,at no time,in no way,not until… 等.