The students visited the History Museum last summer holiday.改成否定句急,改成否定句!过去时不应该加“ed”吗？加了"ed”就应该把“do”改成“did”啊

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• The students visited the History Museum last summer holiday.改成否定句急,改成否定句!过去时不应该加“ed”吗？加了"ed”就应该把“do”改成“did”啊
• We visited a museum of ____ (nature) history last Sunday.
• 1.What do you think _____(be) the best part of that day?2.I'm sure you _____(enjoy) these presents.3.----I called you just now,but nobody answered.Where _______? -----I was out with my mother.A.were you        B.are you         C.have you gone       D.have you been to4.----What a nice MP4 How long _____ you ____  it?  ----Only two days.A.have;bought      B.did;buy        C.have;had         D.are;having