作业帮Nancy ____ _____ _____for three hours.Nancy started to study three hours ago.
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Nancy ____ _____ _____for three hours.Nancy started to study three hours ago.
Nancy ____ _____ _____for three hours.Nancy started to study three hours ago.
Nancy ____ _____ _____for three hours.Nancy started to study three hours ago.
Nancy （has been studying )for three hours. Nancy started to study three hours ago.
Nancy （has been studying )for three hours.
has been studying