---Why does the lake smell terrible?---Because large quantities of water________.[ ]A.have pollutedB.is being pollutedC.has been pollutedD.have been pollut-高中英语-n多题

◎ 题干

---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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