When writing a biography of Napoleon she_________some unknown facts.A、stumbled a

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问题 When writing a biography of Napoleon she_________some unknown facts.

选项 A、stumbled across
B、stumbled through
C、stumbled at
D、stumbled over

答案 A

解析句意：她在写拿破仑的传记时，无意中发现了一些不为人知的事情。stumble across(无意间发现，偶然发现)；stumble through(结结巴巴地说)；stumble over(结结巴巴地说)。

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