问题
选择题
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
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。