问题补充:
The children were made 12 hours a day.
A. work
B. worked
C. working
D. to work
答案:
A. work
B. worked
C. working
(答案→)D. to work
解析:在主动语态中,make sb do sth,而在被动语态中,被省略的to 要加上去,故选D
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