she sings a song 改进行时态

she sings a song 改进行时态

She is singing a song now. 现在进行时.
She was singing a song yesterday. 过去进行时.
She has been singing a song for ten minutes this morning. 现在进行完成时.
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第1个回答  2017-08-09
She is singing a song.
第2个回答  2017-08-09
She is singing a song
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