They lived a hard life and were often made for over ten hours a day.A. workB. to workC.

问题补充：

They lived a hard life and were often made for over ten hours a day.

A. work

B. to work

C. to working

D. worked

答案：

A. work

(答案→)B. to work

C. to working

D. worked

解析：考查非谓语动词。make sb do sth让某人做某事，在被动语态中为sb be made to do，故选B。