who are these boys?they are students____to Class One.

问题描述:

who are these boys?they are students____to Class One.
A.belong B.belonging

--他们是一班的学生.
因为已经有了宾语(动词)are了,所以belong要用-ing形式,即belonging,也就是第二个选项B.此时belonging to做studentsd的定语,用来修饰students的.