Once ___, it can never be forgotten.A.seeB.to be seenC.seenD.saw-英语

题目简介

Once ___, it can never be forgotten.A.seeB.to be seenC.seenD.saw-英语

题目详情

Once ___, it can never be forgotten.
A.seeB.to be seenC.seenD.saw
题型:单选题难度:偏易来源:不详

答案

C
seen是过去分词,它用作时间状语时,常与once, when, whenever, while,until一起用.

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