Most students in the class think that Mr Smith is a nice tea

1.答案：D.
2.
1）该题think后面是一个宾语从句：Mr Smith is a nice teacher they find_____ to get along with.
2）该宾语从句中Mr Smith是主语,is a nice teacher是系表结构.
而they find ___ to get along with则是定语从句,修饰先行词teacher.
该定语从句的关系代词被省略,则明显说明关系代词在定语从句中做(find的)宾语.
3）而且关系代词在定语从句中是代替先行词的.
所以只需要将先行词teacher代人定语从句中去,则为：
they find the teacher ____ to get along with
所以该题只需要填入形容词easy即可.
they find the teacher easy to get along with
= they find the teacher is easy to get along with
= they find it easy to get along with the teacher
= they find it is easy to get along with the teacher.
4）该题they find the teacher easy to get along with中,find为感官动词,而the teacher为宾语,easy to get along with为宾语补足语.

B
整理句子
they find it that Mr Smith is easy to get along with
题中只是顺序改变了，it为形式主语