His speech was heard by a group of judges, （ ） agreed that it was the best one this year.
A、
whose
B、
which
C、
all of which
D、
all of whom
【正确答案】：D
【题目解析】：
本题考查非限定性定语从句连接词的判断与使用。
分析句子结构，有逗号隔开说明为非限定性定语从句，先行词为“judges评委“，且从句缺少主语，故D选项“all of whom”符合题意。
句意：那一群听了他的演讲的评委们，都认为这是今年的最佳演讲。