9.The reason why the lake smells terrible is that large quantites of water _____(被污染了).(pol

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9.The reason why the lake smells terrible is that large quantites of water _____(被污染了).(pol
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9.The reason why the lake smells terrible is that large quantites of water _____(被污染了).(pol
9.The reason why the lake smells terrible is that large quantites of water _____(被污染了).(pol

9.The reason why the lake smells terrible is that large quantites of water _____(被污染了).(pol
has been polluted

was polluted
has been polluted

have been polluted
quantities of 后无论是可数名词还是不可数名词 谓语都不用单三

用被动的形式呀