The retired workers were invited to the pany， surprise，changes had been so great over the years.
A. whose
B. who
C. to whom
D. to whose
网友回答
A. whose
B. who
C. to whom
(答案→)D. to whose
解析：考查定语从句。本定语从句的先行词是The retired workers,关系代词whose指代先行词在定语从句中放在名词的前面做定语。句意：那些退休的工人被邀请回到公司，让他们惊讶的是，在这几年里，公司发生了巨大的变化。故D正确。