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：考查介词加关系代词引导的定语从句。让某人惊讶的是，用to one’s surprise结构，排除A,B；先行词是workers，在定语从句 surprise,changes had been so great over the years.中作名词surprise的定语，要用whose修饰，所以选D。