the children are required not to leave the building unless.to do soA being told B they will be told C be told D told 详细解释一下吧 谢谢!

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thechildrenarerequirednottoleavethebuildingunless.todosoAbeingtoldBtheywillbetoldCbetoldDtold详细解释一下吧

the children are required not to leave the building unless.to do soA being told B they will be told C be told D told 详细解释一下吧 谢谢!
the children are required not to leave the building unless.to do so
A being told B they will be told C be told D told 详细解释一下吧 谢谢!

the children are required not to leave the building unless.to do soA being told B they will be told C be told D told 详细解释一下吧 谢谢!
英语人士也喜欢省略啊.一楼的答案是对的.

D
这里省略了 (unless they are ) told

d