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

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

admin2012-08-05  87
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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