they only had a scrap of information with which to work form

后面应该是work from。。翻译成 从。。。开始工作with which to work from 并非从句,而是一个疑问词+不定式的复合结构,在句子中做定语。他们只能从获得的少量信息着手开始工作。 再问： 如果不加which 可以么？比如：they only had a scrap of information to work form 再答： 如果是form的话，我理解错了， 这里应该是定语从句 with which to work form 定语从句主语to work, 谓语form,形成 但好像还是要用forms work form这里我无法理解，sorry。