问题补充：
I don’t know .
A. how much the population in Beijing is
B. what is the population of Beijing
C. how much is the population in Beijing
D. what the population of Beijing is
答案：
A. how much the population in Beijing is
B. what is the population of Beijing
C. how much is the population in Beijing
(答案→)D. what the population of Beijing is
解析：考查宾语从句：宾语从句如果是疑问句的话，语序要变成陈述句语序，而且问人口是多少，用what，所以选D，句意是:我不知道中国的人口是多少。
