◎ 题干
---- John ,why are you so upset?
----I _________ my cellphone all morning but it is nowhere to be found.
A.am looking for B.have looked for
C.have been looking forD.had looked for
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“---- John ,why are you so upset?----I _________ my cellphone all morning but it is nowhere to be found.A.am looking for B.have looked forC.have been looking fo…”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。