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 "

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题目内容（西安交通大学--英语三）

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
"

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乐山师范学院-行政管理学