◎ 题干
---Has Tom finished his job yet?
  ---I have no idea of it; he _____ it this morning.
A.has been doing B.had been doing  C.did   D.was doing
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“---Has Tom finished his job yet? ---I have no idea of it; he _____ it this morning.A.has been doing B.had been doing C.did D.was doing…”主要考查了你对  【一般现在时】【将来进行时】【过去完成进行时】【过去将来时的被动语态】  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。