题干
The workers in this small factory were made ______ extra hours every day.
A：work
B：working
C：to work
D：to be working
答案(点此获取答案解析）
C
The workers in this small factory were made ______ extra hours every day.
A：work
B：working
C：to work
D：to be working
的解集是
，则
的值是 （ ）