How many students in your school have lunch at home?- Only of us have lunch at hom

问题补充：

--- How many students in your school have lunch at home?

--- Only of us have lunch at home.

A. two hundreds

B. two hundred

C. hundreds

D. hundred

答案：

A. two hundreds

(答案→)B. two hundred

C. hundreds

D. hundred

解析：句意：——你们学校有多少学生在家吃午饭？——我们中只有两百人在家吃午饭。hundred, thousand, million等有数词修饰时，结尾不加-s。故选B。