英语翻译The professor could hardly find the sufficient grounds________英语解答

英语翻译
The professor could hardly find the sufficient grounds_______his arguments in favor of the new theory.
A.to be based on B.to base on C.which to base on D.on which to base

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解答

选 D
"on which to base"属于“特种不定式”,在句中作定语,相当于定语从句on which he could base...
句意：教授几乎找不到足够的基于他论点的证据来支持他的新理论
教授(the professor)几乎找不到(could hardly find)足够的(sufficient)基于他论点(arguments)的证据(grounds)来支持(in fovor of )他的新理论(new theory)