作业帮Mary ------her lessons from seven to ten last night .我觉得是was doing,但是答案是has been doing.
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Mary ------her lessons from seven to ten last night .我觉得是was doing,但是答案是has been doing.
Mary ------her lessons from seven to ten last night .我觉得是was doing,但是答案是has been doing.
Mary ------her lessons from seven to ten last night .我觉得是was doing,但是答案是has been doing.
from seven to ten应该是时间段(相当于for long 之类的),用完成进行时更好些
was doing是用在时间点上,比如昨晚8点（at eight o'clock yesterday)正在做什么
答案错的吧。我觉得是did。
答案错了，你是对的，这个很显然是过去进行时
一段时间。。。。。。。。。。
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