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
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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。Herbeing careless是-ing形式复合结构，在句中充当主语。故选B。