为什么不能用many of them 替代many of which?The new dictionary contains 16,000 new words and expressions,many of which reflect recent research in science and technology.

Many of them owned by or affiliated with national broadcasters.请问此处them为什么不能用which代替? 为什么不能用many of them 替代many of which?The new dictionary contains 16,000 new words and expressions,many of which reflect recent research in science and technology. I have many books,some of them are on English.这个句子表达正确吗?我知道这个句子是错误的,但是我不知道为什么在这里不能用some of them. For many years,people _____ electric cars.However,making them has been more difficult than predicted.[ ]A.had dreamed of B.have dreamed of C.dreamed of D.dream of为什么不能用过去完成时 many of them能不能说many of they?为什么?Many of them were my friend.中 China has a lot of famous writers,one of -----is Lu XUn,为什么不能用them I don’t like either of them. Please show me another, 为什么不能用 all of them Though there are few Chinese but have heard of the Great Wall,many of them haven't been there yet.1.前面有though还能用 双重否定结构的定语从句?2.many of them haven't been there yet.为什么不加连词,他是一句话啊,怎么单放 ___ ___Red Cross,many people were saved in the war.为什么不能用because of? She brought with her three friends,none of whom I had ever met before.为什么不能用none of them? there are 39 students in my class in all,21 (of which) are girls.为什么不能用 of them? many different places hold many games.为什么不能用have Today many people can use computers,but very______of them how to repair them为什么不能用very a few of?答案是few.My friend Tom left ______Shanghai _____New York_____the morning of June 2A.for...to...in...B.from...to...in C./...to...in D./...f I have many friends.Jim is ( )of them谢,为什么? English has many rivers,____are very longA.none of which.B.all of them.C.no one of them.D.neither of which为什么不选B?那从语法讲为什么B不可以呢？ two hundred people died in the accident._____children.选哪个?为什么?A.many of them wereB.many of them areC.many of whom wereD.many whom were Results of official`s physcial exam were notified to them last week为什么不能用现在完成时,Results have been notified to them last week Tagore wrote many famous poems,many of ___ were translated into Chinese.A.that B.them C.which Dwhat为什么选C不选B?