With more trees being destroyed, huge quantities of soil ________ each year.
| A．are washing away | B．is being washed away |
| C．has been washed away | D．are being washed away |
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With more trees being destroyed, huge quantities of soil ________ each year.
| A．are washing away | B．is being washed away |
| C．has been washed away | D．are being washed away |
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