问题补充：
More than 100 million people live in the beautiful province, .
A. most of them live in the east
B. most of them in the east
C. most of them are from the east
D. most of them are living in the east
答案：
A. most of them live in the east
(答案→)B. most of them in the east
C. most of them are from the east
D. most of them are living in the east
解析：逗号前面是一个句子，如果逗号后还是句子就必须有连词，ACD都是句子但没有连词，故排除，所以选B。这是独立主格结构。独立主格结构的构成：名词(代词)+现在分词（过去分词；形容词；副词；不定式；名词；介词短语）
独立主格结构的特点：
1）独立主格结构的逻辑主语与句子的主语不同，它独立存在。
2）名词或代词与后面的分词，形容词，副词，不定式，介词等是主谓关系。
3）独立主格结构一般有逗号与主句分开。
