The cruel boss had the staff ____fourteen hours a day.

题目

The cruel boss had the staff ____fourteen hours a day.
A.working B.work 我选的是B,但是答案上是A,请问为什么?

答案

意思是,老板让工人一直持续工作14个小时.
have sb.done 让某人被做什么事情
have sb.doing 让某人一直做什么事情
have sb.do 让某人做什么事情