Now the problem of energy is becoming critical (关键的,紧急的), so it calls for an immediate (solve)

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问题 Now the problem of energy is becoming critical (关键的,紧急的), so it calls for an immediate (solve)

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答案solution

解析 由本题的前句可知,能源问题严重,因此需要应对方案。而后句中的空格作介词 for的宾语,且空格前有“定冠词+形容词”修饰,因此要填入solve名词形式solution。
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