— the population of the U.S.A. in ?—It about 296 million.A. What is; isB. What was;

问题补充：

— the population of the U.S.A. in ?

—It about 296 million.

A. What is; isB. What was; wasC. How many was; was

答案：

解析：句意：美国人口是多少？大约296 million。对population提问常用What，时间是，所以用一般过去时。population相当于一个整体,谓语是但是，所以用was。故选B。

考点: 考查疑问词和动词时态的用法。