While doing calculation for the project, the designers______a new solution to a

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问题 While doing calculation for the project, the designers______a new solution to a geological problem.

选项 A、fell into
B、stumbled upon
C、set out
D、discovered

答案 B

解析 A项fall into“被卷入……”；B项stumble upon“偶然发现”；C项set out“启程，出发”；D项discover“发现，发觉”。从四个选项看，含有“偶然”含义的“stumbleupon”最适合本句话。

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