Question

the only person

this is the only person __i know in beijing . A who B that
Miss Green is the only person （） can help you with your English。
A who B that
答案第一个是that第二个是who。。。。。。
到底是看the only用that还是看person用who呢？
那要是this is the only person __i know in beijing 打错了是this is the only person __know me in beijing
我记得都是做主语，
是不是作宾语就不痛了？

Answer 1

1. 这种题目没有太大意义。

2. 按照定语从句的语法来说：当先行词词被the very, the only，the same,the last修饰时，关系代词最好用that. 如：
1) This is the very good dictionary that I want to buy.
2) After the fire in his house, the old car is the only thing that he owned.

3. 但是当先行词指人时，偶尔也可以用who.
如：Wang Hua is the only person in our school who will attend the meeting.

4. the only person做先行词时，还是看the only，而且关系代词的选择跟其在定语从句中做主语还是做宾语没有关系。

Answer 2

第一个是作know的宾语吧
第二个是作为定语从句的主语
至于this is the only person __know me in beijing，个人觉得是that, 引导定语从句修饰person，因为有only，所以用than而不用who（附：know应为knows)

Answer 3

其实区别不是那么严格的，出这种考题有点矫情。