题目内容
【题目】She sings a song in the room. (改为现在进行时)
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【答案】She is singing a song in the room.
【解析】
句意为她在房间里唱歌。题意要求改为现在进行时，结构为：be+doing，主语she为单数第三人称，be应用is，sing的现在分词为singing，故答案为She is singing a song in the room.
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