it's not easy____ the students_______ their homeworkA.for,to finishB.of,to finish

it's not easy____ the students_______ their homeworkA.for,to finishB.of,to finish
it's not easy____ the students_______ their homework
A.for,to finish
B.of,to finish

it's not easy____ the students_______ their homeworkA.for,to finishB.of,to finish
选A,记住,这是常用句型,对于什么人来说用for

A easy for someone to do

A，it's not easy for the students to finish their homework
it's so diligent of the students to finish their homework
对比一下这两个句子。