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A few days ago,Mary said to Sara,"I must finish this experim

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A few days ago,Mary said to Sara,"I must finish this experiment this week.” 改为间接引语
A few days ago,Mary said to Sara,
A few days ago,Mary told Sara that she must finish that experiment that week.
楼上的朋友回答有小小失误.
顺便回答一下追问:此句中,must无须变时态的!
我是初中英语老师,如果还有问题 ,