为何用two score of people

score意为二十，它与dozen, hundred, thousand, million等词一样，前面有确定
数字时，不加s，但可以与介词of连用，但hundred, thousand和million前面
有确定数词时，不能跟of短语。没有确定数词时加s及of表示许许多多。

如：
a dozen pencils 一打铅笔
dozen, hundred etc有特指的时候才加of
如：I have already bought two dozen of those pencils in the shop near my home .注意those pencils 就是表特指的一个标志
又如：Shortly after the accident,two dozen police were
sent to the spot.此句中无this those these 等指代词表特指

而score 不管特不特指均加of 。
如They told me two score of people would take part in
the meeting .

two score years 四十年

a score of eggs 二十个鸡蛋

three hundred students 三百名学生

hundreds of students 数百名学生

The bus can hold two score and ten people. 这辆汽车可以容纲50人。

Scores of people took part in the game. 许多人参加了这次比赛。

亲，这个可以参考语法书中”数词“那一单元。答案对的。
two score of people意思是“大约四十人”，而“scores of people”则是“许多人”的意思，scores of people这个词本身就已经表示了“许多”的意思了，前面还要加"two"，矛盾了。死记是没有用的，