.—How many people are there in the hall?—About two people are listening to the speech.A.

问题补充：

.—How many people are there in the hall?

—About two people are listening to the speech.

A.hundreds of B.hundreds C.hundred

答案：

解析：句意为：---有多少人在礼堂?---大约有两百人在听演讲。当hundred/thousand/million等前面有确切数字时，hundred/thousand/million不加s，且没有of；当hundred/thousand/million等前面无确切数字时，hundred/thousand/million加s，且有of。根据语境可知应选C。