这个是同位语从句吗7.It is obvious to the students ---D--- they should

判断同位语从句和主语从句最简单的方法就是 看 that连接前后是不是表示的同样的意思。比如 it is the fact that practice makes perfect。这是个很明显的同位语从句,因为fact就是practice makes perfect。但是看看这句话显然 the students和 they should get well prepared for their future不是表达相同意思,理解了吧。