题文
-Why does the water smell terrible?
-Because large quantities of water __________.
| A．is being polluted | B．have been polluted |
| C．is polluted | D．has been polluted |
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-Why does the water smell terrible?
-Because large quantities of water __________.
| A．is being polluted | B．have been polluted |
| C．is polluted | D．has been polluted |
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