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 經(jīng)過多年的研究,他宣稱我們正面臨著我們時代最嚴(yán)重的環(huán)境問題.

解答 答案A
本題考查非謂語動詞作狀語,主句主語he與動作observe之間存在邏輯上的主謂關(guān)系,所以應(yīng)該使用observe的現(xiàn)在分詞形式作狀語,又因為狀語動作observe先于主句謂語announced發(fā)生,故應(yīng)使用現(xiàn)在分詞的完成時即Having observed作狀語.

點評 考查非謂語作狀語時,一定要分析狀語動作與主句主語的邏輯關(guān)系,這是確定使用現(xiàn)在分詞還是過去分詞的關(guān)鍵.

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