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He __on this essay for twenty minutes but he __only a hundre

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He __on this essay for twenty minutes but he __only a hundred words .
A has been working ,has written Bis working ,writes C has worked ,has been writing D works ,is writing
选A,他谢这篇文章已经持续了20分钟(可能还将持续下去),但他只写了100字(在这20分钟里)
has been doing表现在完成进行时,has done表现在完成时
望对楼主有所帮助