Many of them owned by or affiliated with national broadcasters.请问此处them为什么不能用which代替?

Many of them owned by or affiliated with national broadcasters.请问此处them为什么不能用which代替? Many of them are family -- Have you seen many sheep in the distance?--Yes,__________.A.thousands of them B.two thousands of them C.two thousand of them D.two thousand them many of them能不能说many of they?为什么?Many of them were my friend.中 There are 331 more islands there,（ ）with places to stay.A.many of which B.and many of whichC.and many of them D.many of them为什么选D?不解... 翻译How many of them are boys? How many of them are languages? How many of them are piaying是什么意思? Many of them decided to stay I have many friends, -------are businessmen.A some of them B of who them C some of whom D some of which Many chileren like eating_____ A.ice cream b.dumplings c.noodle d.all of them Many children love chocolate .Very什么 of them 什么them She has many friends,but she knows ( ) of thShe has many friends,but she knows ( ) of them well.A.most B.few C.some D.many , The number of the villagers here ______,but many of them don’t have jobs.A.is many B.is large C.are many D.are large I have many friends,( )some are businessmen.A.of them B.from which C.who of D.of whom I have many friends,___most are teachers.A.of them B.from which C.who of D.of whom I have many friends,___most are teachers.A.of them B.from which C.who of D.of whom Professor Li has a large collection of books,____are written in foreign languages.【从 句考点】A.many of which B.many of them C.many ones of which D.many books of which