His parents used to play Majiang in their spare time,----- -------?A.did they.B.couldn't they.C.used they.D.used he

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His parents used to play Majiang in their spare time,----- -------?A.did they.B.couldn't they.C.used they.D.used he

His parents used to play Majiang in their spare time,----- -------?A.did they.B.couldn't they.C.used they.D.used he
His parents used to play Majiang in their spare time,----- -------?
A.did they.B.couldn't they.C.used they.D.used he

His parents used to play Majiang in their spare time,----- -------?A.did they.B.couldn't they.C.used they.D.used he
前肯后否,正确的只有B

B 陈述部分带有情态动词 used to时,附加疑问部分用used或 use或did。如:
⑧Peter used to swim in winter,usedn't /usen't /didn't he?