The demand Afor electricity Bcan not readily be met Cwere it not for another source Dof energy—nuclear power.

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问题 The demand Afor electricity Bcan not readily be met Cwere it not for another source Dof energy—nuclear power.

选项 A、 
B、 
C、 
D、 

答案B

解析 应改为could,表示非真实的假设。
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