A interested
形容人的用interested
find sb interested in sth(doing sth)是固定短语
A
find sb. +adj.做宾补，补充说明sb.
I found him _A_in dancing.
A interested
B become interested
C interst
因为found后有宾语是只能跟分词，不能跟动词不定式，所以选A 。
答案满意吧
A
A
人+interested in 对...感兴趣
a 把
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