◎ 题干
_____ I had seen him yesterday at the airport!

A. If
B. If only
C. Only if
D. Since
◎ 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 had seen him yesterday at the airport! [ ]A. If B. If only C. Only if D. Since …”主要考查了你对  【从属连词】【虚拟语气】  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。