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The knife _____we used to cut things is very sharp.

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The knife _____we used to cut things is very sharp.
答案是 with which,我理解,是cut with结构,但我想问,为什么不能是which?让knife做used的宾语,即:The knife which we used to ...,( we used the knife to cut...).懂我的请回答,谢谢!
1 The knife WITH WHICH we used to cut things was very sharp.--------是对的,因为退回到原始句就是:The knife was very sharp,so we (used to )cut things WITH IT .------括号中的内容可以省略
2 The knife THAT / WHICH we used to cut things was very sharp-------也是对的.退回到原始句就是:The knife was very sharp,so we USED IT to cut things.
3 这样一来,就可以看出,出题人的英语水平并不理想,他的英语还没有学到家.