is caused是一般现在时态的被动形式,没有体现出“现在正在进行”需动词ING,而Be动词的现在进行时为Being,就类似于have done是现在完成时 在中间加been（be动词的过去分词）就构成了现在正在完成的.所以现在被动进行式
water pollution,which is being caused by factory waste这句话为啥要
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