-- They look so tired.
--Yeah. They day and night. So they are all in poor health.
A. are made work
B. are made to work
C. made to be worked
D. are making to work
网友回答
A. are made work
(答案→)B. are made to work
C. made to be worked
D. are making to work
解析：考查动词make的用法。make sb do sth，使某人做某事，do前面不能加to，而在被动语态中，必须加上to，故选B。