I think ____ necessary to look for more information about the boo_英语解答

I think ____ necessary to look for more information about the book
这里应该填什么,T_T

人气：134 ℃　时间：2019-10-17 01:37:08

解答

it
it作形式宾语,真正的宾语是后面的动词不定式,为了避免头重脚轻现象,所以用it作形式宾语.