问题描述：
the school rules state that no child shall be allowed
the school rules state that no child ____ be allowed out of the school during the day,unless accompanied by an adult.
A.may B.shall C.can D.must
为什么C.D 不行呢
the school rules state that no child ____ be allowed out of the school during the day,unless accompanied by an adult.
A.may B.shall C.can D.must
为什么C.D 不行呢
问题解答：
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