The professor could hardly find sufficient grounds ______ his arguments in favor

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问题 The professor could hardly find sufficient grounds ______ his arguments in favor of the new theory.

选项 A、on which to base
B、which to base on
C、to base on
D、to be based on

答案 A

解析

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[originaltext]W:WhataretheadvantagesofE-education,ProfessorGu?M:There