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应该选择哪个?原因是什么?

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Theprofessorcouldhardlyfindsufficientgrounds()hisargumentsinfavorofthenewtheory.A.tobebasedonB.tobas

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应该选择哪个?原因是什么?
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
应该选择哪个?原因是什么?

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应该选择哪个?原因是什么?
选D...which指代ground...
前面的介词on必须有,因为这里相当于用了base on the ground这个短语..在定语从句中当用which指代了ground,ground前面的on还是应该存在.但这时候自然要加在 which前面,所以变成了on which to base

d
定语从句 base on的介词提前
句意 教授找不出支持他新理论的根据

B
base on,固定搭配,它的宾语是前面的sufficient grounds

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