When ______ the reason for their success, the kids had two explanations: hard wo

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问题 When ______ the reason for their success, the kids had two explanations: hard work and their parents’ encouragement.

选项 A、asking
B、asked
C、having asked
D、had asked

答案 B

解析省略用法题。当状语从句的主语与主句的主语一致时，可省略主语和系动词。when asked the reason for their success是从句的省略形式，完整的说法是when they were asked the reason for their success，故选项B正确。

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