◎ 题干
I don't know when Martin _____ I'll meet him at the airport when he _____.
[     ]
A. will return; return              
B. returns; will return
C. returned; returned              
D. will return; returns
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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 don't know when Martin_____ I'll meet him at the airport when he _____. [ ]A. will return; returnB. returns; will returnC. returned; returnedD. will …”主要考查了你对  【实义动词的单数第三人称形式】【一般将来时】  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。