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【題目】When walking down the street, I came across David, when I _____ for years.

A. didn’t see B. haven’t seen

C. hadn’t seen D. wouldn’t see

【答案】C

【解析】試題分析：句意：當(dāng)沿著街道散步的時(shí)候，我遇見(jiàn)了多年未見(jiàn)的David。根據(jù)語(yǔ)境，“not see”這個(gè)動(dòng)作發(fā)生在come across之前，是過(guò)去的過(guò)去發(fā)生的動(dòng)作，用過(guò)去完成時(shí)。故選C。

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