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2个英语上的疑问这句,Dolly's DNA is exactly the same as that of the sh

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2个英语上的疑问
这句,Dolly's DNA is exactly the same as that of the sheep she was cloned from.里面为啥会要突然出现个of ?去掉of不行么?
还有What is ink used for ?
It's used for writing in. 为啥句尾要有个in ?麻烦详细解释一下,谢谢.
2个英语上的疑问这句,Dolly's DNA is exactly the same as that of the sh
of是所有格,前面有个Dolly's DNA,与后面的that of the sheep相对应,不能去掉.
意为 多利的DNA和他所克隆的羊的DNA是完全相同的.
ink本身是不能写字的,要放在笔里才能写字,所以加in.
如果是what is pen used for?回答就可以是 It's used for writing.