问题
选择题
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
答案
答案：C
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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：C