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

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——such heavy pollution already,it may now be too late to clean up the river.
A:Having sufferer B:Suffered from C:To suffer D:suffer from
A的应该是suffered

我选 A
首先,这是一个句子,已经有谓语了,所以要填一个非谓语,故排除 D
其次,to do 不定式引导目的状语,有already,证明不是目的,故排除 C
最后,非谓语动词表示的动作与主语it是主动关系,故选A~

——such heavy pollution already,it may now be too late to cle -----such heavy pollution already,it may now be too late to ___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 —It is too late .I must leave now —I can not ___allow you to