单项选择题

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
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单项选择题
He _______ so much work that he couldn’’t really do it efficiently.
A．put on
B．turned on
C．brought on
D．took on
单项选择题
If the whole opera, on ______ beforehand, a great deal of time and money would have been lost.
A．was not planned
B．has not been planned
C．had not been planned
D．were not planned
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