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 选什么?
人气：227 ℃ 时间：2019-08-22 14:13:35
解答
选D,主语是quantities,复数.所以用have
water 和 polluted是被动关系,所以用BE动词.
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