i have a book,the cover of which is blue.Which为什么不可以变成it啊,it不可以指代前面的book吗?

I have kept the book （for a week）.提问()() have () kept the book? i have a book on the desk改同义句-------a book on the desk I have _______ English book.a an the I have a book on the desk改为同义句 I have a book on the desk改为同义句I have a book on the desk改为同义句 __ __a book on my desk i have booked a book 改成疑问句、是have i book a book 还是have i booked book? I have a book on the desk .的同义词_____ _____ a book on the desk 快快快快呀 I have got a book on the desk.意思不变转换句子（ ）（ ）a book on the desk. I will write a preface when I have finished the book.和 I will write a preface when I finish the book 的区别, i have a book in the bag改为同义句,同义句_____ _____ a book in _____bag I have a book.改一般疑问句 I have a book.改一般疑问句 I have a new english book? I,book,have,a连词成句 I have a new book 如何提问 翻译 i have a book为洼厄语 I do have a book on May I have a book () your photos?