Nicholas Winton’s rescue action went unnoticed for half a century until in 1988 _______ found a detailed scrapbook in their atti

题目：Nicholas Winton’s rescue action went unnoticed for half a century until in 1988 _______ found a detailed scrapbook in their attic, containing lists of the children, their parents' names, the names and addresses of the families that adopted these children.

A. his wife

B. his neighbor

C. his daughter

D. a thief

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