insist on doing sth坚持做某事(尤指麻烦或令人讨厌的事)eg:She will insist on washing her hair just when I want to have a bath. insist that 加
从句表坚决主张坚决要求=insist upon,eg:1They insisted that everyone should come to the party2He insisted upon checking everything himself【这种情况on与upon也可以互换】至于insist in的说法就不及普遍了,表某方面,表达没有那么强烈。