If a bag is filled with books and pens,it must belong to som

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If a bag is filled with books and pens,it must belong to someone ___ works hard.
If a bag is filled with books and pens,it must belongs to someone works hard．
A．which B．／ C．whom D．who
someone是不定代词,不定代词后面不是只能填that吗?

that 在定语从句中是既可以指人也可以指物,当先行词是all, something,nothing等不定代词用that,这是that 和which 在比较是都在指物的情况下,不包括指人时.当先行词是 those, one, ones, anyone, someone等并且指人时,我们只用who
再问：您确定当先行词是 those, one, ones, anyone, someone等并且指人时，我们只用who 吗？也就是说当指人不定代词是someone、anyone、everyone...的时候，就一定要用who，不可用that吗？
再答：唉，我都不知道怎么解释清楚了。不好意思啊不是一定的。给你看一个句子When I feel scared, I can do some things to feel better. I can tell someone that I'm scared. 害怕的时候，我可以做些事情让自己感觉好过些，如告诉别人我很害怕。我已经不记得那些条条框框的语法了，但是我一读句子，就可以准确的选择出来。

The bag is filled with books.（同义句转换） The bag is filled with books.（同义句转换） The bag _____ _____ ___ the bag is ———books and it is too heavy fr me to carry A.fil 5.The bag is filled with books.( 改为同义句) The bag________ ____ I found a bag filled with several books(改为同义句) 排列with they books old the bag filled many i have a bag with books in it 单项选择1.The box is ____ books.A.fill with B.full with C.filled whose bike is this?it ___ belong to Adam.Look!His bag is on 连词成句 the,filled,with,bag,presents,is 对划线部分提问 There is a book and tow pens in the bag. There is (a book and two pens) in the bag.（对括号部分提问）