they sang a nice song yesterday改为否定句
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theysanganicesongyesterday改为否定句theysanganicesongyesterday改为否定句theysanganicesongyesterday改为否定句theydid
they sang a nice song yesterday改为否定句
they sang a nice song yesterday改为否定句
they sang a nice song yesterday改为否定句
they didn't sing a nice song yesterday.
they did’t sing a nice song yesterday.