With more forests being destroyed，huge quantities of good earth ________ each year.
| A．is washing away | B．is being washed away |
| C．are washing away | D．are being washed away |
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With more forests being destroyed，huge quantities of good earth ________ each year.
| A．is washing away | B．is being washed away |
| C．are washing away | D．are being washed away |
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