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'
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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
单项选择题
______ another generation from that of their parents, young people have different taste, ideas and beliefs.
A．Belonging to
B．Belonged to
C．They belong to
D．They belonging to
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