单选题 It is necessary to build modern power stations which will produce electricity as ＿＿＿＿＿＿＿＿＿＿ as possible. 的答案

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题目内容：
It is necessary to build modern power stations which will produce electricity as ＿＿＿＿＿＿＿＿＿＿ as possible.
题目选项

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