-----such heavy pollution already,it may now be too late to

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-----such heavy pollution already,it may now be too late to clean up the river A having suffered B
C to suffer D suffered A 河道和污染是被动的关系,看了一些相关的解释不太明白.

句意为：这条河流已经遭受很重的污染,现在要清理为时太晚.
本题考察分词短语作状语的用法.
分词作状语,其逻辑主语是句子主语,而本句主语看似为it,实际it作形式主语,
真正主语为不定式,而不定式前应视为省略其逻辑主语for people.
这样一来就清楚了,应用现在分词,再依据already的提示,应用完成时态.
所以用Having suffered.

-----such heavy pollution already,it may now be too late to ——such heavy pollution already,it may now be too late to cle ___such heavy pollution already,it may now be too late to cl ___such heavy pollution already, it may now be too late to c ____such heavy pollution already,it may now be too late to c ( )such heavy pollution today,it may now be too late to clea having suffered such heavy pollution already,it may now be t Having suffered sruch heavy pollution already it may now be as is known to everybody ,it may now be too late to clean up it may now be too late to clean up the river没怎么理解帮我看一个英语句子,eg：Having suffered such heavy pollution already,it now,donnot,if,go,but,i,too,will,it,be,late,football,play,to,