题目内容：

对...有兴趣是have an interest in还是have interest in.
在练习卷上看过have an interest in,也看过have much interest in
请问是二者都对,还是……
应该怎样使用?

优质解答

都对呀.interest即可以为可数名词（C）,也可以为不可数名词（U）.
兴趣;关注;爱好[C][U][(+in)]
I developed an interest in the machine.
I have lost my interest in chemistry.
2.趣味性[U][(+to)]
Local color added interest to the novel.地方色彩增加了这部小说的吸引力.
3.感兴趣的事物或人[C]