◎ 题干
— How long has the man been waiting?
— He _____ for 20 minutes. 

A. has been waiting          
B. is waiting
C. was waiting              
D. will wait
◎ 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 the man been waiting?— He_____ for 20 minutes.[ ]A. has been waitingB. is waitingC. was waitingD. will wait…”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。