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-___is her daughter?-The girl on the right wearing blue jean

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-___is her daughter?-The girl on the right wearing blue jeans.
答案是which,为什么?
为什么不是who
在用作定语修饰其后接名词时,只用which和what,不能用who.which和what的区别是:前者用于选择范围较小或较明确的场合,后者用于选择范围较大或不明确的场合.如:
Which color do you like,black or white?黑色和白色,你喜欢哪种?
Which is bigger,the sun or the earth?太阳和地球哪个大?
What color is your car?你的汽车是什么颜色的?
但是,若指人,即使选择的范围不明确,也可用which.如:
Which [What] writers do you like?你喜欢哪些作家?
当其后不接名词时,三者均可用,which和what的用法区别依然是:前者用于选择范围较小或较明确的场合,后者用于选择范围较大或不明确的场合.如:
Which is in the box,the red one or the black one?哪一个在盒子里,是红色的那个还是黑色的那一个?
What is in the box?盒子里装的是什么东西?
至于who,它一般只用来指人,不管选择范围大还是小、明确还是不明确均可用.如:
Who won –– Tom or Mike?谁赢了,是汤姆还是迈克?
Who is your favorite poet?你最喜欢的诗人是谁?
注:当选择范围比较明确且用作宾语时,who也可以用which或which one代之.如:
Who [Which / Which one] do you like better,your father or your mother?你更喜欢谁,父亲还是母亲?