The retired workers were invited to the company surprise changes had been so great over t

问题补充：

The retired workers were invited to the company, surprise,changes had been so great over the years.

A. whose

B. who

C. to whom

D. to whose

答案：

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。