◎ 题干
Mr. Smith's _________. Let's wait for him here.  
[     ]
A. hasn't arrived    
C. doesn't arrive
B. didn't arrive      
D. couldn't arrive
◎ 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“Mr. Smith's _________. Let's wait for him here.[ ]A. hasn't arrived C. doesn't arriveB. didn't arriveD. couldn't arrive…”主要考查了你对  【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。