the only person who/that

中国英语界有个流行弊病，以为the only person/man/woman/one 之后的定语从句要用 that 引导，不可以用 who/whom 引导。实际上，用 who/whom 引导不但正确，还远远比that多。

google books http://books.google.com/ 的结果：

the only person who : the only person that 12100,000 : 773,000
the only man who : the only man that 5650,000 : 741,000

英国语料库http://corpus.byu.edu/bnc/：
the only person who/that 108:19

美国当代语料库http://corpus.byu.edu/coca/：
the only person who/that 510:154

请看最权威的工具书：

柯林斯高级英语用法词典（COLLINS COBUILD DICTIONARY OF ENGLISH USAGE):
The only people who will be killed are those who have knowledge which is dangerous to our cause.