this is the book which you asked for 是正确句子
问题描述：
this is the book which you asked for 是正确句子
那为什么说：this is the book which you asked 就不对
答
ask for sth 要某物,
由于which代替book是ask到形式宾语,所以必须加上for.
ask sth的意思是询问某事.在这里意思不符合.