No one has _______________________ (做出一个令人信服的解释) why dinosaurs died out. come up

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问题 No one has _______________________ (做出一个令人信服的解释) why dinosaurs died out.

选项

答案 come up with a convincing explanation of

解析本处考查惯用词组come up with，后面可以接a(n)idea/plan/explanation等等。“令人信服的解释”应译作a convincing explanation。另外，why引导介词宾语从句，因此of不能省略。

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