the college degree is well worth it为什么末尾要加it

it is (well/very) worth doing 填哪一个 为什么 The book is well worth what I paid for it . It isn't worth it 中为什么后面要加it?而不是It isn't worth whatever is worth doing at all is worth doing it well.为什么这里的 whatever is worth doing at all is worth doing （it） well.为什么 it is worth the trouble为什么trouble前面加了the it was well worth the effort 英语翻译这里为什么是 it really is worth the effort 而不是it really worth It is worth discussing the question.为什么不对? The book is _________ great value. It is well worth ________ .the book is written by Jk Rwling .It is well worth reading. I think the film is quite___success and it is well worth see