When writing a biography of Napoleon she ______ some unknown facts.

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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 stumble across无意间发现,偶然发现。stumble through结结巴巴地说话;跌跌撞撞地经历。stumble at踌躇,迟疑。stumble over给…绊倒;结结巴巴地说。  
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