2. 外语
  3. While doing calculation for the project, the designers ______ a new solution to a geological problem.

While doing calculation for the project, the designers ______ a new solution to a geological problem.

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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 句意：在对工程进行计算时，设计人员碰巧找到了解决地质问题的方法。fall into含义为“被卷入……”；stumble upon含义为“偶然找到，发现”；set out含义为“启程，出发”；discover含义为“发现，发觉”。从四个选项看，含有“偶然”含义的stumble upon最适合本句话。
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