The book we read in the library is very interesting.要带定语的，这句话指的是物，那么定语应该加在哪里呢？定语从句应该放在被修饰的词(先行词)的后面。本句因为引导词在定语从句中作宾语，所以省略了。如果不省略的话，应该是：The book which / that we read in the library is very interesting. “我们在图书馆里读的那本书非常有趣”希望能够帮到你，别忘了点击采纳啊！