the school rules state that no child shall be allowedthe 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

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the school rules state that no child shall be allowedthe 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 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 shall be allowedthe 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
(尤用于正式文字中表示允诺、命令或法令)〈正〉可; 必须; 必将 这是shall得一个特殊用法,相应的must也有必须的意思,但是shall更加适合.而can表示能这种意思就不大适合.

C答案的can用于肯定句里,表示一种可能性,是“可能,也许”的意思,而不是“可以”的意思。
D答案的must,是必须的意思,不符合句意。
B答案shall表示将会怎么样。
整句话的意思是:学校政策规定,除非有成人陪伴,否则孩子不能出校。

shall 表将来的意思
shall be allowed (一般将来时的被动语态)将被允许
句意:学校政策规定:除非有成人陪伴,否则孩子不允许出校。