Even though it is at least 20 years _____ we got to know, I can’t forget the scene_____ we were introduced to each other.A.that , whereB.when, in whichC.since , whenD.since, where
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D解析考查特殊句式和定语从句。第一空是一个特殊句式：It be 一段时间since从句 自从…以来有一段时间了。第二空考查定语从句。we were introduced to each other的结构非常完整，所以应该使用关系副词做状语。句意：即使我们认识至少20年了，我还是无法忘记我们被相互介绍的那一幕。