◎ 题干
It's over twenty years ______ we met last. Can we recognize each other when we meet at the airport?

[     ]

A. before
B. until
C. since
D. once
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“It's over twenty years ______ we met last. Can we recognize each other when we meet at the airport?[ ]A. before B. until C. since D. once …”主要考查了你对  【从属连词】  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。