【题目】Children, if well ________, are not likely to make any trouble in public places.
A.having educated
B.educating
C.to be educated
D.educated

【答案】D
【解析】句意：如果受到良好的教育，孩子不可能在公共场所惹麻烦。句子主语Children和educate之间是被动关系，此处省略了相同的主语和be动词，是if+过去分词做条件状语，故选D。