the professor can hardly find sufficient grounds on which to base his argument in favor of the new theory黑体词组怎么理解,我不明白为什么不是被动呢

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• the professor can hardly find sufficient grounds on which to base his argument in favor of the new theory黑体词组怎么理解,我不明白为什么不是被动呢
• the professor can hardly find sufficient grounds on which to base his argument in favor of the new theory黑体词组怎么理解,我不明白为什
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