题目内容
【题目】They didn't（walk/walked）to school yesterday.
【答案】walk
【解析】yesterday指昨天，应为过去式，而前面已经有助动词过去式did,所以后面用动词原形。
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题目内容
【题目】They didn't（walk/walked）to school yesterday.
【答案】walk
【解析】yesterday指昨天，应为过去式，而前面已经有助动词过去式did,所以后面用动词原形。