这是我所读过的最难的一本书 This is the most difficult book that I have____ _____
问题描述：
这是我所读过的最难的一本书 This is the most difficult book that I have____ _____
答
This is the most difficult book that I have （ever read).完成时，ever read表示你读过所有的书，望您采纳~~~
答
ever read