While attempting to look into the case, ______.

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问题 While attempting to look into the case, ______.

选项 A、he found it was difficult
B、the case was difficult
C、it happened that the case is difficult
D、difficult as the case

答案A

解析逻辑主语。本题中状语部分非谓语形式是现在分词attempting，是主动形式，所以主语应该是人。故答案为A。

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