* Who knows____dictionary it is?
A.who's B.whose C.whom D.who
应该选B
whose“谁的” (代词 )
whom和who都是“谁” (人称代词)
who是主格,就是说要作主语,得放在动词前面.而whom是宾格,就是说它只能做宾语,得放在动词或者介词的后面.再例如：
1,Who is there?
2,Who is waiting for you?
不过口语中常常用who代替whom,例如：
3,Who are you?
4,Who are you waiting for?
以上是初级英语,下面中级英语.
这三个都是关系代词
1）who,whom
这两个词代替的先行词是人的名词或代词,在从句中所起作用如下：
Is he the man who wants to see you?
他就是你想见的人吗?（who在从句中作主语）
He is the man whom that I saw yesterday.
他就是我昨天见的那个人.（whom在从句中作宾语）
2) Whose 用来指人或物,(只用作定语,若指物,它还可以同of which互换）,例如：
They rushed over to help the man whose car had broken down.那人车坏了,大家都跑过去帮忙.
Please pass me the book whose (of which) cover is green.
