◎ 题干
I have to see the doctor because I ________ a lot lately.
A.have been coughing B.had coughed
C.coughed D.cough
◎ 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“I have to see the doctor because I ________ a lot lately.A.have been coughingB.had coughedC.coughedD.cough…”主要考查了你对  【现在完成时】【现在完成时的被动语态】  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。