His parents used to play Maijiang in their spare time,_____?A)did they B)couldn't C)usedn't they D)usedn't he

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His parents used to play Maijiang in their spare time,_____?A)did they B)couldn't C)usedn't they D)usedn't he

His parents used to play Maijiang in their spare time,_____?A)did they B)couldn't C)usedn't they D)usedn't he
His parents used to play Maijiang in their spare time,_____?
A)did they B)couldn't C)usedn't they D)usedn't he

His parents used to play Maijiang in their spare time,_____?A)did they B)couldn't C)usedn't they D)usedn't he
只能选否定形式,即C和D,B中缺少主语,parents是复数,所以选C