It was through Jack _____ Mary got to know Bob .A.who B.whom

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It was through Jack _____ Mary got to know Bob .A.who B.whom C.how D.that
因为是强调句,所以选D,但为什么不能选A呢?当前面是人名,不是可以选who吗?
Why don’t we take a little break?
Didn’t we just have______.
A.it B.that C.one D.this
选C，为什么A，D不对？
Someone is at the door,who is
A.this　　　 B.that　　　 C.it　　　 D.he
为什么选C？

It was through Jack 用that ,
是主语从句,that引导的从句是it 这个主语代词的具体内容
表示（mary got to know bob） was through Jack.
前面的句子成分已经全了,it was through Jack,用的话,只能用 through whom ,
就是 it was through Jack through whom mary got to know Bob.
这样太罗嗦了,因为本身句子成分不缺,只需要连词 that 引出真正的主语就行了
问题补充：
1 选择 break ,用 C ,因为休息是不一样的,比如说 8:00 到8:15 这是一个休息,8:15到8:30又是一个休息,这是不一样的时刻的休息.
当他问我们要不要休息一下,只能说,我们不是刚刚有过 “一个休息” 吗,不能说特定的
因为人家问的这个休息跟刚刚那个休息,不是同一个,所以不能用 “ it,that,this"
2 who is it
那个人可能是 he she,it 是不定代词,that 是定代词,是确认了那个事物之后用的.
像说,That's my friend.That's a desk.
我们问的时候常说what's it?那是什么?但是不说 what's that?

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