doesn't。因为前面是sings,要对应
不选isn't，因为它是be动词
she sings very well,(doesn't)she?
she是第三人称，所以不能直接用do，要用does。
望采纳，谢谢~~
你好！
用doesn't
She sings very well, doesn't she?
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. 选doesn't she
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