单项选择题

A ______ change in policy is needed if relations are ever to improve.

A．strict
B．wide
C．ever
D．radical
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单项选择题
Calculations, which are astronomically exact, have been made ______ with the use of computers.
A．possible
B．it possible
C．possibly
D．to be possible
单项选择题
A beam of light will not bend round the corners unless ______ to do so with the help of a reflecting device.
A．being done
B．made
C．to be made
D．having made
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