the professor can hardly find sufficient grounds on which to base his argument in favor of the new t

the professor can hardly find sufficient grounds on which to base his argument in favor of the new t

题目
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
答案
没有被动 .应该是这样的 :教授很难找到足够的理由来支持他得新理论.
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