◎ 题干
-I'm afraid you can't smoke here. Look at the sign,please.
-I'm Sorry , I_____see it
[     ]
A. didn't      
B. haven't    
C. won't      
D. can't
◎ 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'm afraid you can't smoke here. Look at the sign,please.-I'm Sorry , I_____see it[ ]A. didn'tB. haven't C. won't D. can't…”主要考查了你对  【助动词】【一般过去时】  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。