◎ 题干
—How long has Sam been skating?
—He _____ for five hours.

A. have been skating
B. has been skating
C. was skating
D. has been skated
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“—How long has Sambeen skating?—He _____ for five hours.[ ]A. have been skatingB. has been skatingC. was skatingD. has been skated…”主要考查了你对  【现在完成进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。