—Why does the lake smell terrible?
—Because large quantities of water _____.
| A．have polluted. | B．is being polluted. |
| C．has been polluted. | D．have been polluted. |
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—Why does the lake smell terrible?
—Because large quantities of water _____.
| A．have polluted. | B．is being polluted. |
| C．has been polluted. | D．have been polluted. |
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