It is estimated that nearly 100 million people live here most of in the west.A. whichB.

问题补充：

It is estimated that nearly 100 million people live here, most of in the west.

A. which

B. whom

C. that

D. them

答案：

A. which

(答案→)B. whom

C. that

D. them

解析：本题考查定语从句。句中先行词为100 million people，在定语从句中作most of的宾语，故选B。句意：据估计，大约有1亿人住这儿，大多数在西部。