【題目】When walking down the street, I came across David, whom I _____ for years.
A.didn't see
B.haven't seen
C.hadn't seen
D.wouldn't see

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

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