He had a lot of friends, only a few of were invited to his wedding.
A. whom
B. them
C. which
D. who
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(答案→)A. whom
B. them
C. which
D. who
解析：考查定语从句。本题定语从句的先行词是a lot of friends，在后面的定语从句中whom指代先行词作为介词of的宾语。Them不能引导定语从句，which所指代的先行词常常是事物，不能是人；who在句中通常作为主语，不做宾语。故A正确。