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 _____ 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？