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

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

出自：石家庄铁道大学-土木工程-大学英语III

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