THE workers were so tired that they fell asleep where they without undressing

题目

THE workers were so tired that they fell asleep where they without undressing
A lying B were laying C lied D were lain
正确答案是B 请分析一下原因
那是B 是手滑了 = = 应该是 were lying

答案

其实这四个都不对
where they were lying
where they were laying sth