The little boy is always interested ______ music.A with B by C in D at

问题描述:

The little boy is always interested ______ music.A with B by C in D at

c,be interested in 是一个固定搭配

C be interested in 固定搭配,对什么感兴趣

选C be(am、is、are)interested in 对……感兴趣.

C be interested in 是一个固定短语