12、The professor can hardly find sufficient grounds         his argument.

A．which to be based on                         B．on which to base

C．which to be based                      D．which to base

12、B

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The professor can hardly find sufficient grounds         his argument.

A．which to be based on                         B．on which to base

C．which to be based                      D．which to base

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The professor can hardly find sufficient grounds          his argument in favor of the new theory.

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The professor can hardly find sufficient grounds　 ________ his argument in favor of the theory.

A．which to base on　　 B．on which to base

C．to base on which　　 D．which to be based

 

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