see to it that中的it 是that后面引导的从句的形式主语吗?

see to it that... see to it that中的it 是that后面引导的从句的形式主语吗? as I see it,中的it 是固定含义吗? it is because that person wants to see it is i____ to see that everything go well See to it that the door is shut. That animal is _____.No one wants to see it. i will see to it that the door____(be) clear. He makes it difficult to see.make it difficult to see怎么理解?省略了that吗,从句? 其中的the general You will have to see to it that the general is safe while he is here.问：其中的the to see it as it really I'll see __ everything is ready in timeI'll see __ everything is ready in timeA.it to that B.that to it C.to that it D.to it that请问为什么呢? I'll see to it . see stick-to-it-ness It's lovely to see It is easy to see that the people of different cultures have always copied each other.请问句中的that 和have怎么理解的呢? a lot of people come to see it 中的come to 是在语法上属于什么成分? 改错：It is important that she goes to see the doctor immediately .It is important that she goes to see the doctor immediately .A B C D看看哪错了,是D么?