单选题 As we all know, it was______that made his dream broken.
  • [A] her being careless
  • [B] because of her carelessness
  • [C] because she was careless
  • [D] she was so careless


【正确答案】 A
【答案解析】[解析] 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 care- less动名词复合结构，在句中充当主语。