They don't have a dream job on mind.They think__is no difference between jobs.

问题描述:

They don't have a dream job on mind.They think__is no difference between jobs.
A:it B:there C:that D:this

B
think后跟宾语从句(也就是说跟一个完整的句子)
there is no difference between jobs
(工作没有差别)