— How much did the company donate to build the school library?— About three yuanA. milli

问题补充：

— How much did the company donate to build the school library?

— About three yuan．

A. million

B. millions

C. million of

D. millions of

答案：

(答案→)A. million

B. millions

C. million of

D. millions of

解析：当前面有数词，表示具体数目时，million等词后不加s，故选A。