7.________ is it ________ has caused this global warming?(  )
A.What;whatB.What;thatC.How;howD.How;that

分析 是什么導致了全球變暖?

解答 答案是B.考查強調句,本題被強調部分是疑問詞what,根據(jù)強調句中強調疑問詞的固定結構:特殊疑問詞+is/was it that…,所以答案選B.

點評 答強調句型這類題目,分析句子結構是關鍵.隨著高考考點的不斷深入變化,強調句型總是以新的面孔出現(xiàn),或本身發(fā)生變化,或與其他句式結構相結合,然而萬變不離其宗,總是脫不掉it,be,that/who這一框架,它的句式特征1:Is/Was it+被強調部分+that…;結合特殊疑問詞構成特殊疑問句形式.句式特征2:特殊疑問詞+is/was it that…?理解句意掌握特征能夠很好的把握解題的技巧.

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