题目

As we all know, it was _____ that resulted in the terrible car accident.    A. because of her carelessness  B. her being careless    C. because she was careless     D. she was so careless 答案：B 解析: 本题可采用减元法，把强调句型中的It was…that…去掉，就不难看出该句缺少主语。Her being careless是-ing形式复合结构，在句中充当主语。故选B。

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