The professor could hardly find sufficient grounds his arguments in favor of the
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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
试题答案
D
解析:
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.