(单选题)17: The professor could hardly find sufficient grounds ________ his arguments in favour of the new theory.
A: to be based on
B: to base on
C: which to base on
D: on which to base
(责任编辑:admin) |
(单选题)17: The professor could hardly find sufficient grounds ________ his arguments in favour of the new theory.
A: to be based on
B: to base on
C: which to base on
D: on which to base
(责任编辑:admin) |