— ________ have you learned to play the piano?
— ________ five years ago.
| A．How long, For | B．How often, For |
| C．How long, Since | D．How soon, Since |
— ________ have you learned to play the piano?
— ________ five years ago.
| A．How long, For | B．How often, For |
| C．How long, Since | D．How soon, Since |
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