The school rules state that no child ____be allowed out of the school during the day ,

问题描述:

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 为什么选B啊,应该选C啊

can一般表示能够,表示一种能力或者意愿;而shall在此理解为应该之意.原题中,题意为“学生不应该被允许在白天离开学校,除非有家长陪同.”所以空格处应该填写一个表示应该的词,故选B.