—Hi, why are you here?—I ________ for Susan for 15 minutes.A. have been waitingB. have waitingC. am waitingD ambeen waiting-初中英语-n多题

◎ 题干

—Hi, why are you here?
—I ________ for Susan for 15 minutes.
A. have been waiting
B. have waiting
C. am waiting
D am been waiting

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◎ 解析

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◎ 知识点

根据n多题专家分析，试题“—Hi, why are you here?—I ________ for Susan for 15 minutes.A. have been waitingB. have waitingC. am waitingD ambeen waiting…”主要考查了你对【一般现在时】，【过去进行时】，【过去完成进行时】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。

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