such heavy pollution already, It may now be too late to clean up the river.A．Suffering. B．Having suffered. C．To suffer. D．Suffered. 题目和参考答案——青夏教育精英家教网—

题目内容

such heavy pollution already, It may now be too late to clean up the river.

A．Suffering. B．Having suffered. C．To suffer. D．Suffered.

【解析】

试题分析:句意：已经受到这么严重的污染了，清理河流可能太晚了。河流和suffer之间是主动关系，而且遭受污染发生在谓语动词之前，应该用现在分词的完成式，故选B。

考点：考查非谓语动词

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