They had been ( )about the origin of the universe for several hours without reaching a conclusion.They had been ( B )about the origin of the universe for several hours without reaching a conclusion.B.debating D.discussing为什么不选D,“讨论”

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They had been ( )about the origin of the universe for several hours without reaching a conclusion.They had been ( B )about the origin of the universe for several hours without reaching a conclusion.B.debating D.discussing为什么不选D,“讨论”
They had been ( )about the origin of the universe for several hours without reaching a conclusion.
They had been ( B )about the origin of the universe for several hours without reaching a conclusion.
B.debating D.discussing
为什么不选D,“讨论”不行吗?

They had been ( )about the origin of the universe for several hours without reaching a conclusion.They had been ( B )about the origin of the universe for several hours without reaching a conclusion.B.debating D.discussing为什么不选D,“讨论”
debate争论 应该更符合句意

本句大意是“他们已经就宇宙起源问题争论了好几个小 时而没能达成一致的结论。”应该说“讨论”也大致说得过去,但是正如中文“漂亮”与“美丽”还是存在某些微妙差别的,而作为这类选择题一般都是要选择最佳答案,故用debating更佳。