Contrast may make something appear more beautiful than it is when ______ alone.

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问题 Contrast may make something appear more beautiful than it is when ______ alone.

选项 A、seen
B、is seen
C、to be seen
D、having been seen

答案A

解析考查分词的用法。在than引起的从句中，it和see之间是被动关系，因此要用过去分词seen；而且，分词可以直接跟在while或when的后面作状语，例如：Look out for cat’s when crossing the street. (过街时注意车辆。)

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专业英语四级

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