◎ 题干
—I hear Sam has gone to Qingdao for his holiday.  
—Oh, how nice ! Do you know when he        ?  
[     ]
A. left                          
B. was leaving
C. has left                        
D. had left
◎ 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“—I hear Sam has gone to Qingdao for his holiday.—Oh, how nice ! Do you know when he?[ ]A. left B. was leavingC. has leftD. had left…”主要考查了你对  【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。