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

问题补充：

— the population of the U.S.A. in ?

—It about 296 million.

A. What is; is B. What was; was C.How many was; was

答案：

解析：what什么；how many多少个；句意：２００５年美国的人口是多少？——大约两亿九千六百万。英语中询问某国、某地有多少人口时,不用\How much...?\,而用\How large...?\;在问具体人口时用\What...?结合语境可知上下文描述的是过去某事的状态，故用一般过去时态。选B。