-____the population of your town?

-____the population of your town?
C.what's D.how large is
解析··
不是，C是What's the number of
可是答案是C额···我也选d

楼主开始没有说清楚啊,既然这样这题选D.具体分析如下：
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...\.例如:
-How large is the population of your hometown?你们家乡有多少人口?
-The population of our hometown is nearly twice as large as that of yours.我们家乡的人口是你们家乡人口的将近两倍.
-What is the population of Canada?加拿大的人口有多少?
-The population of Canada is about 29 million.加拿大的人口大约有二千九百万.