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【题目】He taught us how to use this machine today. (改为一般疑问句)
he you how to use this machine today?

【答案】Did;teach
【解析】根据taught句子时态是一般过去时,谓语是行为动词,变疑问句时借助于助动词did,谓语动词用原形,taught的原形teach,所以答案是:Did; teach。

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