Why does the lake smell terrible?Because large quantities of water( )a have polluted b is beingpolluted c has been polluted d have been polluted 选什么?
问题描述：
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?
答
c
water是不可数名词，后面用单数
被污染了，应该是被动，而且是已经被污染，就用完成时的被动
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答
选D
quantities 做主语，谓语动词用复数。如a quantity of 做主语，of后是可数名数复数，谓语用复数，如果后面是不可数名词，谓语动词用单数。
因此BC可排除，因为都是单数。而water与pollute之间是动宾关系，宾语提前，用被动。故选D
答
D
水是被倒，所以用被动语态
这句话是指水倒进湖后对现在湖的影响，所以用现在完成时。
答
C
这里要用完成时态，表示过去动作对现在的影响。
主语是water不可数，所以选has
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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