题目

As we all know, it was ______ that resulted in the terrible car accident.A.because of her carelessness B.her being carelessC.why she was careless D.she was so careless 答案：【答案】B【解析】考查it强调句型。句意：我们都知道，是她的粗心大意导致了这场可怕的车祸。本句是强调结构“It was +被强调部分+ that+ 句子的其他成分”，去掉It was ... that，不难看出resulted in the terrible car accident缺少主语，此处的被强调部分是主语，所以此处用动名词（-ing形式）复合结构作主语，h（2009?南岗区一模）哈市居民用的煤气已有15年以上的历史了，下列物质中属于“哈依”煤气成分的是（ ）①H2②CO  ③C2H50H    ④C   ⑤CH4．A．①②⑤B．②④C．②D．②③⑤