The aged are close companions, and many of have known each other for decades. A. themB. th

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(答案→)A. them
B. that
C. whom
D. what
解析：本题考查代词。句意：这些老人们是亲密的朋友，并且他们许多人已经相互认识了几十年。本句中and连接两个独立的句子，下文代词指代前文The aged故用人称代词。选项BCD一般用于引导从句，故选A。