题文
If you keep ______ ,you’ll be a very good swimmer one day.
| A．practising to swim | B．practising swimming |
| C．to practise to swim | D．practise swimming |
If you keep ______ ,you’ll be a very good swimmer one day.
| A．practising to swim | B．practising swimming |
| C．to practise to swim | D．practise swimming |
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