单项选择题

Wind power is an ancient source of energy ______ we may return in the near future.

A．on which
B．by which
C．to which
D．from which
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单项选择题
______ our manager objects to Tom s joining the club, we shall accept him as a member.
A．Until
B．Unless
C．If
D．After
单项选择题
One reason for her preference for city life is ______ she can have easy access to places like shops and restaurants.
A．that
B．how
C．what
D．why
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