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Ответ:

1.

Have you ever seen a dodo? 

You have never seen a dodo, have you?

What have you never seen?

Who has never seen a dodo?

Have you or your grandparents ever seen a dodo?

2.

 Did your grandparents see a dodo?

Your grandparents never saw a dodo, did they?

Who never saw a dodo?

Whose grandparents never saw a dodo?

Did you or your grandparents see a dodo?