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

问题补充：

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

A. them

B. that

C. whom

D. what

答案：

(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。