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How dirty the floor is! You should have someone _____ it at least twice a day.
A.mopB.to mopC.mopping D.mopped
A

试题分析:考查have的用法,have sb do sth意思“让某人做某事”,所以选A,句子意思“地板好脏啊,你本应该让某人一天至少拖地两次”
点评:have的用法是常考内容,只要知道它的用法,have sb do sth意思“让某人做某事”,就很容易选择了
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