I think it neccessary for students to take an interest in all subjects .这里的it是作形主还是形宾,it作形主还是形宾是看前面的句子,还是看从句,

问题描述:

I think it neccessary for students to take an interest in all subjects .
这里的it是作形主还是形宾,it作形主还是形宾是看前面的句子,还是看从句,