How many people will come to Beijing for the Olympic Games in ?　　　— It’s hard to say.

问题补充：

How many people will come to Beijing for the Olympic Games in ?

— It’s hard to say. people, I think.

A. Million of

B. Millions of

C. Two millions of

D. Two million of

答案：

A. Million of

(答案→)B. Millions of

C. Two millions of

D. Two million of

解析：句意：有多少人来参加的北京奥运会？这很难说。我认为有好几百万人吧。数以百万计的表达是million后加s再加介词of，而million前面如果有数词修饰，则在后面直接跟名词的复数形式，故选B。