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