◎ 题干
—Excuse me , Have you got an eraser?
—Sorry, I haven't.  Why _____ you ask Mary? Perhaps she has one.
[     ]
A.  do    
B.  don't  
C.  did    
D.  didn't
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Excuse me , Have you got an eraser?—Sorry, I haven't.Why _____ you ask Mary? Perhaps she has one.[ ]A.doB.don't C.didD.didn't…”主要考查了你对  【助动词】【一般现在时】  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。