填空题

No sooner ______ (我一出门，就认识到错了)．

【参考答案】

had I left home than I realized my mistake
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单项选择题
According to the author, energy security can only be achieved by ______ .
A．using less oil in power generation
B．replacing fossil fuels with more nuclear power
C．seeking energy self sufficiency
D．expanding the sources of power supply
填空题
needs
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