The letter is form my sister,_____is working in Beijing.为什么用who,不用that、which

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The letter is form my sister,_____is working in Beijing.为什么用who,不用that、which

The letter is form my sister,_____is working in Beijing.为什么用who,不用that、which
The letter is form my sister,_____is working in Beijing.
为什么用who,不用that、which

The letter is form my sister,_____is working in Beijing.为什么用who,不用that、which
sister is working in beijing,所以用who,指代sister
用which的话 表示the letter is from my sister这句话is working in beijing.显然错的
that在定语从句中不出现在逗号后,所以that 也是错的

因为working in beijing指的是前面的人在北京工作,是my sister,并不是那封信

其实 my sisiter is working in Beijing.但是从句中无须再写出my sisiter,否则句子太啰嗦.所以用WHO来替代my sister.
who 指代人

从句是补充说明你姐姐 而不是信 是你姐姐在北京工作. 前面是from吧