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Do you know the reason ____ she has changed her mind?

A. why               B. which              C. for that         D. of which

Do you know the reason ____ she has changed her mind?

A. why 　 B. which　 C. for that　 D. of which

Do you know the reason ____ she has changed her mind?

A. for that             B. which   C. why               D. of which

Do you know the reason ____ she has changed her mind?

 Do you know the reason ____ she has changed her mind?

       A. for that             B. which            C. why                     D. of which