The professor could hardly find sufficient grounds _____his

The professor could hardly find 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
aj3110 1年前 已收到1个回答 举报

raycatarmy 春芽

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D

on which to base his arguments in favor of the new theory =" The" professor will base his arguments in favor of the new theory on sufficient grounds.

1年前

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