选who或that都对，不必纠结。原来是为了避免that和those有重复（用作指示代词时，that是单数，those是复数），现在，已没有该限制了。

1. 首先需要说明的是，those充当先行词时，多指“人”，也可指“物或其他动物”。

2. those用作先行词，关系代词指“人”时可以用who，也可以用that。

1. The new law toughens up penalties for those that misuse guns.  新法对滥用枪支的处罚更为严厉。

来自柯林斯例句

2. The votes in the marginals are those that really count.  边缘席位的选票才是最关键的。

来自柯林斯例句

3. Give to those that need.  救济贫困者。

来自《现代英汉综合大词典》

4. Those organisms that are most suited to the environment will be those that will survive.  最适宜该环境的微生物将会存活下来。

来自柯林斯例句

5. Care must be taken to unite with all those that can be united with.  必须注意团结一切可以团结的人。

来自《现代汉英综合大词典》

6. Few people ever noticed him, and those that did tended to make game of him. 

很少有人理睬他, 而凡是理睬他的都倾向于恶意地捉弄他.

来自《用法词典》

7. The effect was to disrupt the food chain, starving many animals and those that preyed on them.  其结果就是破坏食物链，使很多动物和那些以捕食它们为生的动物饿死。

来自柯林斯例句

8. Together with those that have been already examined, there are nineteen. 算上已经查对过的, 一共十九封。

来自英汉文学 --- 《败坏赫德莱堡》

9. The men she likes are those that flirt with her.  她喜欢在她面前无拘无束的男人。

来自辞典例句