单项选择题

At present much more stress has been laid ______ law and order by the local government.

A．onto
B．at
C．on
D．to
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单项选择题
Mary ______ that the purchase had been a mistake. However, she didn't.
A．ought to acknowledged
B．ought to have acknowledged
C．should acknowledge
D．should be acknowledging
单项选择题
Physics is the present day equivalent of ______ used to be called natural philosophy, from ______ most of present day science arose.
A．which, what
B．that, which
C．what, which
D．what, that
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