The volunteers sent books to a mountain village school on Children’s Day.A. two hundreds

问题补充：

The volunteers sent books to a mountain village school on Children’s Day.

A. two hundreds of

B. two hundred of

C. two hundreds

D. two hundred

答案：

A. two hundreds of

B. two hundred of

C. two hundreds

(答案→)D. two hundred

解析：考查数词的用法。固定短语hundreds of“成千上万”，前面不能加数词；如果有数词，hundred不用复数形式，且后面不加of。