◎ 题干
    __________you_________your e-mail today?          
—Yes, I                    it this morning.                       
[     ]
A. Have, checked, have checked    
B. Have, checked, checked          
C. Did, check, checked   
D. Did, check, have checked
◎ 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“__________you_________your e-mail today?—Yes, Iit this morning.[ ]A. Have, checked, have checked B. Have, checked, checkedC. Did, check, checkedD. Did, che…”主要考查了你对  【一般过去时】【现在完成时】  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。