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问题: 关于定语从句

The knife we cut the bread is very sharp.
A. with which B. with that C. which D. that
请写出详细的选择理由

解答:

The knife we cut the bread is very sharp.
A. with which B. with that C. which D. that
答案 :A. with which

理由:
1.为什么选有"with"的选项: "we cut the bread "是句子中的定语从句,负责修饰先行词"The knife",主句说:"这把刀很锋利."定语从句进一步的阐释是怎么样的一把刀——“我们用来切面包的”(那把刀)。
那么把先行词还原到从句中应在的位置上时,就是"we cut the bread __the knife",表示用什么工具做某事用"with"这个介词.

2.为什么选"with which "这个选项: 本来这里的关系代词用"which"或者"that"都可以,但是,此处将从句中的介词"with"前置到了关系代词之前,那么当从句介词被提前时,它后面的关系代词就不能用"that"而必须用"which".