The workers were made ______ all day and all night by bosses in the old days.

         A. work             B. working         C. worked        D. to work

The workers were made ______ all day and all night by bosses in the old days.

1. A.
   work
2. B.
   working
3. C.
   worked
4. D.
   to work

The workers were made ______ all day and all night by bosses in the old days.