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

分析 是什么导致了全球变暖?

解答 答案是B.考查强调句,本题被强调部分是疑问词what,根据强调句中强调疑问词的固定结构:特殊疑问词+is/was it that…,所以答案选B.

点评 答强调句型这类题目,分析句子结构是关键.随着高考考点的不断深入变化,强调句型总是以新的面孔出现,或本身发生变化,或与其他句式结构相结合,然而万变不离其宗,总是脱不掉it,be,that/who这一框架,它的句式特征1:Is/Was it+被强调部分+that…;结合特殊疑问词构成特殊疑问句形式.句式特征2:特殊疑问词+is/was it that…?理解句意掌握特征能够很好的把握解题的技巧.

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