Scientists had (寻找) for a solution to the mystery, but they didn't find it.

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1. (2018高一下·山东期中) Scientists had (寻找) for a solution to the mystery, but they didn't find it.

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高中英语人教版（2019）必修第三册 Unit 3 Diverse Cultures课时跟踪检测（二） Warming Up & Reading — Language Points