被动语态These worker were made --- all day and all nightA,to wor

答案选 A
简单一点来说就是,
词组：make sb do sth 让某人做某事（省略to的动词不定式）
变成被动时为：sb be made to do sth （即：还原to）
类似用法还有：see,hear,watch,notice,have等
再如：see sb do sth 看见某人做某事
被动：sb be seen to do sth 某人被看见做某事
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