问题补充：
That is the best way you thought of into trouble.
A. stopping some young people to get
B. to prevent some young people getting
C. keeping some young people getting
D. preventing some young people getting
答案：
A. stopping some young people to get
(答案→)B. to prevent some young people getting
C. keeping some young people getting
D. preventing some young people getting
解析：考察句子结构。You thought of 的宾语是way，作way的定语，主句为the best way to prevent some young man (from) getting into trouble, prevent用法是，prevent sb (from) doing sth ,组织某人干某事
句意为，那是你认为最好的阻止年轻人染上麻烦的方法。
