The tool with _____he is working is called a pump.

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The tool with _____he is working is called a pump.
The tool with _____he is working is called a pump.

The tool with _____he is working is called a pump.
The tool with which he is working is called a pump. 相当于
The tool which he is working with is called a pump.
他用的工具叫抽水泵
He is working with a tool (which is) called a pump.也表达同样的意思
be working with a tool.用什么工具工作

which

whhich