问题标题：
（）theproject,theyhavetostaythereforanothertwoweeks.A.notcompletingB.notcompletedC.nothavingcompletedD.havingnotcompleted求详解
问题描述：
（）theproject,theyhavetostaythereforanothertwoweeks.A.notcompletingB.notcompleted
C.nothavingcompletedD.havingnotcompleted求详解
李文斌回答：
C从过去到现在在到将来用完成时态而他的否定时态则在前面加否定词not
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