单选题 Brisbane Associates has revealed that several customers of ______ have recently moved to rival brokerage firms.
A. them
B. their
C. theirs
D. themselves

【正确答案】 C
【答案解析】选项(C)theirs是Brisbane Associates的所有格名词。选项(A)them是人称代词的宾格。选项(B)their是所有格形容词。选项(D)themselves是反身代词。