Answers

2016-03-30T16:16:47+05:30
She has got the highest mark,hasn't she?

in question tags a positive statement is followed by a negative with the helping verb used in sentence[here,verb is 'has']
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2016-03-30T16:19:30+05:30
She has got the highest mark , hasnt she ?
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she has got the highest mark,isn't she?