The professor could hardly find sufficient grounds _____his arguments in favor o

题干

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

上一题下一题 0.64难度单项选择更新时间:2013-07-03 04:34:11

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