【题目】As is known to us all, ___ in a good atmosphere is what all parents wish for.
A.the children educated
B.the children are educated
C.the children's being educated
D.the children to be educated

【答案】C
【解析】句意：众所周知，孩子们在优良环境教育下接受教育是所有家长所希望的。由于题干中有is，说明此处是填主语结构，children和educate之间是被动关系，只能用动词ing形式的被动形式做主语。根据题意可知选C项。