单项选择题

How much of your country's electrical supply is ______from water power

A．deduced
B．derived
C．detached
D．declined
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单项选择题
In fact, Peter would rather have left for San Francisco than______ in New York.
A．to stay
B．stayed
C．staying
D．having stayed
单项选择题
______their work will give us a much better feel for the wide differences between the two schools of thought.
A．To have reviewed
B．Having reviewed
C．Reviewing
D．Being reviewed
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