第15题: [单项选择](Since the beginning) of this century, more and more scientists (have become) interested (in) (the way how) the human brain works. A. Since the beginning B. have become C. in D. the way how 参考答案:A 答案解析:介词用法错误,应改为At the beginning。at the beginning“在开始时”,是固定搭配。