题目内容
19．聚会结束时我唱了一首歌．Isang a song at the end of the party．
分析 sang a song．
解答 答案：sang a song．这里是说过去的事情用一般过去时，表示唱了一首歌用sing a song，sing动词唱歌，其过去式是sang，故答案是sang a song．
点评 不规则动词的过去式及过去分词要牢记．
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