The scientist could hardly find sufficient grounds ______ his arguments in favor of the new theory. A. which to base on B. to base on C.to be based on D.on which to base

The scientist could hardly find sufficient grounds ______ his arguments in favor of the new theory.
A. which to base on
B. to base on
C.to be based on
D.on which to base

出自：河南城建学院大学英语（三）

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