I think ___a teacher is great\

问题描述:

I think ___a teacher is great\
A be B to be C to being D for being

I think (B to be) a teacher is great.
我认为当一名老师非常好.
空格中要填宾语从句的主语.在四项中,只有不定式to do的形式可以作主语.