When a material burns in the air, heat is released and new substances are______.

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问题 When a material burns in the air, heat is released and new substances are______.

选项 A、separated
B、ruined
C、formed
D、dissolved

答案C

解析这是一道词汇题，考点是意思相近的动词的被动语态的辨析。

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成人本科学位英语

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