题目内容
The professor can hardly find sufficient grounds ____ his argument in favour of the new theories.
A. on which to base
B. which to base on
C. on what to base
D. that to base on
| A |
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题目内容
The professor can hardly find sufficient grounds ____ his argument in favour of the new theories.
A. on which to base
B. which to base on
C. on what to base
D. that to base on
| A |