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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

 

A

 

考查的是非謂語動詞的用法。從already就可以看出,分詞動作發(fā)生在主句謂語動詞前,故需要分詞的完成時。

 

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