There are birds there in the sky.A. Million ofB. five millions ofC. millions ofD. five mi

问题补充：

There are birds there in the sky.

A. Million of

B. five millions of

C. millions of

D. five millions

答案：

A. Million of

B. five millions of

(答案→)C. millions of

D. five millions

解析：句意：天上有成千上万的鸟。Millions of成千上万的，million要用复数；但在具体数字中例如five million五百万，million不用复数，故选C。