The company has recently taken on fifty new workers some of have just graduated from unive

问题补充：

The company has recently taken on fifty new workers some of have just graduated from university.

A. which

B. them

C. those

D. whom

答案：

A. which

B. them

C. those

(答案→)D. whom

解析：本题考察的是定语从句。先行词是fifty new workers,后面的定语从句some of have just graduated from university中介词of后面缺少宾语，先行词是指人的名词，关系词在句中做宾语，只能使用whom指代人的先行词，在句中做宾语。BC不能引导定语从句，A项的先行词必须是物。故D正确。