i bought a book three days ago.改为一般疑问句.

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iboughtabookthreedaysago.改为一般疑问句.iboughtabookthreedaysago.改为一般疑问句.iboughtabookthreedaysago.改为一般疑问句.D

i bought a book three days ago.改为一般疑问句.
i bought a book three days ago.改为一般疑问句.

i bought a book three days ago.改为一般疑问句.
Did you buy a book three days ago?