45.The project_______ (which) they have been working for two years is a total failure.请问为什么用on which

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45.The project_______ (which) they have been working for two years is a total failure.请问为什么用on which
45.The project_______ (which) they have been working for two years is a total failure.
请问为什么用on which

45.The project_______ (which) they have been working for two years is a total failure.请问为什么用on which
work on sth.固定搭配
这种定语从句要是用which引导这个on提到which前

work on sth.致力于,从事于
这里是一个定语从句。用on which they have been working for two years 修饰The project。

The project_on which__ (which) they have been working for two years is a total failure.
定语从句
先行词在从句中做的是地点状语
【 they have been working for two years on the project】
on which=where
所以用on which
有不会的可以再问我