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

答案 D

解析

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Onlywhenyouhaveobtainedsufficientdata______cometoasoundconclusion.A、