2. 外语
  3. The professor could hardly find sufficient grounds______ his arguments in favor of the new theory.

The professor could hardly find sufficient grounds______ his arguments in favor of the new theory.

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问题 The professor could hardly find sufficient grounds______ his arguments in favor of the new theory.
选项 A、to be based on
B、to base on
C、which to base on
D、on which to base
答案D
解析
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