◎ 题干
— How about buying an iPhone 4s for your mother’s birthday?
— Oh, maybe it’s too expensive, Dad. Do you know _______?
A.how much does it cost B.how much it costs
C.how much it cost D.how much did it cost
◎ 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 about buying an iPhone 4s for your mother’s birthday?— Oh, maybe it’s too expensive, Dad. Do you know _______?A.how much does it costB.how much it cos…”主要考查了你对  【同位语从句】【主语从句】【表语从句】  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。