impugn 过去式:impugned 过去分词:impugned 现在进行时:impugning 词形变化: 形容词: impugnable | 名词: impugner | 动词过去式: impugned | 动词过去分词: impugned | 动词现在分词: impugning | 动词第三人称单数: impugns | 词义辨析: 同义参见: impute controvert 反义参见: advocate2