with在这里是什么意思？为什么把那个定语从句分开？

Question

I was impressed by the efficiency with which she handled the crisis

Answer 1

with which she handled the crisis是个定语从句，修饰先行词the efficiency，可以分为两句话来理解：I was impressed by the efficiency （我对这种效率印象深刻）；she handled the crisis with the efficiency（她用这种效率解决了危机）with，介词意思是“用，凭借”.。两句话的公共部分是the efficiency，所以就可以用个定语从句，将从句中的the efficiency替换为which就好，但是with仍然在，所以就是I was impressed by the efficiency which she handled the crisis with。又因为这个介词with位置灵活，也可以放在前面，所以就成了题目中的I was impressed by the efficiency with which she handled the crisis。
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Answer 2

把句子拆开成两部分

I was impressed by the efficiency.
which she handled the crisis with the efficiency.

which she handled the crisis with 修饰 the efficiency, with 作为介词，介词一般提前到which ,what 等前。

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Answer 3

用。。。。（处理危机）
关系代词作介词宾语时，可以把介词前置。；

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