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如何判定A不对,如何排除它?

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thechildrenarerequirednottoleavethebuildingunless.todosoAbeingtoldBtheywillbetoldCbetoldDtold如何判定A不对

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如何判定A不对,如何排除它?
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
如何判定A不对,如何排除它?

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如何判定A不对,如何排除它?
unless在这里做连词,连接两个句子,所以一定接一个句子,主语+谓语+其他,而主语在前面提到,所以后面可以连be动词一起省略,（the children/they are）told to do so.A.是一个非谓语VING形式,所以错误,需排除

B
unless 是状语从句的引导词，后面应加句子。
A being told 是现在分词一般式的被动形式，只能做非谓语。

C
unless在这里做连词，连接两个句子，所以一定接一个句子，主语+谓语+其他，而主语在前面提到,所以后面可以连be动词一起省略，（the children/they are）told to do so

where are the children? Why are the children The children are playing games. the children is 还是are Children are what the mothers are. “children are what the mathers are The children are wearing beautiful clothes.　　The children are_________beautiful clothes. The children are water the trees. The children are water the trees对吗? The children are _______ at the beach. hou nice children they are!的children前要加the吗 These are the（）（ children ）books. what are the children doing是什么意思啊好急呀 The children are working hard.改为感叹句. The children are very happy改为感叹句 where the ether children are的意思 where the ether children are快 The children are playing___(happy)over there.