He asserted that nuclear power was a safe and non-polluting energy source.A:main

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问题 He asserted that nuclear power was a safe and non-polluting energy source.

选项 A:maintained
B:recommended
C:considered
D:acknowledged

答案C

解析本句意思：他认为核能是安全、无污染的能源。assert意为“主张，认为”，与consider（以为，认为）意思相近。maintain维持；recommend推荐；acknowledge（承认）。

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