作业帮Mary ------her lessons from seven to ten last night 为什么填has been doing?
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Mary ------her lessons from seven to ten last night 为什么填has been doing?
Mary ------her lessons from seven to ten last night 为什么填has been doing?
Mary ------her lessons from seven to ten last night 为什么填has been doing?
我觉得has 应为had,可以解释为：过去完成进行时,表示动作的持续,意为从昨晚7点到10点他一直在做功课,没有间歇.
应该用was doing,过去进行时，表示过去一段时间一直在做某事。
为什么不是had呢
Her name is Mary.用Mary提问
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