Question

I have read a series of stories about some world famous great scientists,     are from our country.

A．two of them

B．two of whom

C．both of them

D．both of whom

Answer 1

B

考查定语从句。Scientists是先行词，在定语从句_____are from our country中作介词of的宾语，them不能引导定语从句，排除A,C；two of whom是科学家中的两个，both of whom两个科学家都……。句子中指的是一些科学家，而不是两个。所以选B。