单项选择题

I don’t think he could have done such a stupid thing last night,（）

A. do I
B. could he
C. did he
D. has he

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单项选择题

Physics is the present-day equivalent of（）used to be called natural philosophy, from which most of present-day science arose.

A. that
B. all
C. which
D. what

单项选择题

The professor can hardly find sufficient grounds（）his argument in favor of the new theory.

A. which to base on
B. on which to base
C. to base on which
D. which to be based on

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