When (heat)______, iron can be changed into liquid.heated分词作状语,从句意看,主语与分词形成被动关系,

游客2023-09-24  15

问题 When (heat)______, iron can be changed into liquid.

选项

答案 heated

解析 分词作状语,从句意看,主语与分词形成被动关系,故用过去分词。
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