____such heavy pollution already,it may now be too late to clean up the river.A.Having suffered B.Suffering C.To suffer D.Suffered

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____such heavy pollution already,it may now be too late to clean up the river.A.Having suffered B.Suffering C.To suffer D.Suffered
____such heavy pollution already,it may now be too late to clean up the river.
A.Having suffered B.Suffering C.To suffer D.Suffered

____such heavy pollution already,it may now be too late to clean up the river.A.Having suffered B.Suffering C.To suffer D.Suffered
已经发生的事,应用现在完成时.选A.

d

B

b

D.
根据句意判断,这条河已经被污染了。河是被污染的,用被动。过去分词表示被动含义。
现在分词表示主动含义