—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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