He is often made for twelve hours a day by his boss. A. workB. workingC. to workD. to be

问题补充：

He is often made for twelve hours a day by his boss.

A. work

B. working

C. to work

D. to be working

答案：

A. work

B. working

(答案→)C. to work

D. to be working

解析：在主动结构中make 后加省去to 的动词不定式做宾语补足语。但当make 用于被动结构中时，主动结构中省去的to还得加上。即be made to do sth。句意：他经常被老板迫使一天工作12个小时。故选C。