837.It is required that the students _____ mobile phones in their school,so seldom ______ them using one.
A.not use;will you use
B.should not use;you will see
C.don't use;will you see
D.not use;you will see
838.I lived with my brother this winter and didn't have to pay rent.So I ______ save most of my salary.
A.could
B.would
C.might
D.was able to
837.答案是A;require后接宾语从句时常接should do表示虚拟，should可以省略；此外seldom位于句首时，后面常接倒装语序。
838.答案是D;be able to表示具体做成某件事情的能力。
