___ are very deligent.A.Both the girlsB.Both theyC.The both girlsD.They of both
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A解析试比较：1）所有的孩子们 a.all of the children(the不可省) b.all the children(the可改为these或those.) c.all children d.all one’s children 2）.两个孩子（都）a. both of the children (the不可省) b. both (the ) children c. both one’s children。但为了强调或在简答语中，可放在系动词前。