第12题: [单项选择]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 参考答案: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。