that 引導的是定語從句,且在從句中充當主語!所以不能省略,省略了從句就不完整啦!
另外省略常常用于以下情況：
1、關(guān)系代詞which,whom,who,that在定語從句中作賓語時可以省略.
Here is the man (who/that/whom)you're been looking for.
2、當that在從句中作補語時可以省略.
He is not the man (that) he used to be.
3、當先行詞是reason,而且定語從句中作原因狀語時,關(guān)系代詞可用why,that,也可以省略.
The reason (why/that) he failed was his laziness.
That is the reason (why) I did it.
5、當先行詞是way,且在定語從句中作方式狀語時,關(guān)系代詞可用in which,that,也可以省略.
The way (in which/that) these comrades look at problems is wrong