单项选择题

As a______ president, his views are treated with respect when he is interviewed.

A．former
B．previous
C．late
D．prior
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单项选择题
The time has come______ we can make extensive use of nuclear energy.
A．as
B．while
C．when
D．since'
单项选择题
There is hardly an environment on earth ______ some species of animal or other has not adapted successfully.
A．to which
B．wherever
C．so that
D．as to
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