this is all that we should do中that可省略吗?为什么

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this is all that we should do中that可省略吗?为什么
this is all that we should do中that可省略吗?为什么

this is all that we should do中that可省略吗?为什么
that 作为关系代词引导定语从句时,只要它在定语从句做宾语就可以省略.即使是先行词是all等不定代词,仍然不影响省略问题.但是当做主语时,一律不省略

因为that引导定语从句 并且在定语从句中做宾语 所以that 可省