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
发布时间:2025-06-03 16:49:14
A、to be based on ;
B、 to base on ;
C、which to base on ;
D、on which to base