Yesterday I saw him ___ the classroom alone.

问题描述:

Yesterday I saw him ___ the classroom alone.
A go B enter C to enter D to go into
这里的选项里的To都是动词不定式做宾补吗?

不是的吧,应该选B,see sb do sth,是see接的宾语,跟to没啥关系.口语里可以加to,但考试算错.