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19._____ the problem for many years,he announced that we are now facing the biggest environmental problem of our time.(  )
A.Having observedB.Observing
C.To have observedD.Observed

分析 经过多年的研究,他宣称我们正面临着我们时代最严重的环境问题.

解答 答案A
本题考查非谓语动词作状语,主句主语he与动作observe之间存在逻辑上的主谓关系,所以应该使用observe的现在分词形式作状语,又因为状语动作observe先于主句谓语announced发生,故应使用现在分词的完成时即Having observed作状语.

点评 考查非谓语作状语时,一定要分析状语动作与主句主语的逻辑关系,这是确定使用现在分词还是过去分词的关键.

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