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

问题补充：

He is often made for twelve hours a day by the 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：句意：他经常被老板强迫一天工作十二个小时。be made to do sth被迫做某事。