答案：A

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。