It takes me half an hour _____playing the piano．How about you？
I usually spend 20 minutes ____it．（ ）
| A． |
practicing； on |
| B． |
to practice； in |
| C． |
to practice； on |
It takes me half an hour _____playing the piano．How about you？
I usually spend 20 minutes ____it．（ ）
| A． |
practicing； on |
| B． |
to practice； in |
| C． |
to practice； on |
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