第7题: [单项选择]The best solution to the problem can only be found by a process of trail and ______. A. mistake B. error C. success D. experiment 参考答案:B 答案解析:trail and error是固定的用法,意为“反复试验,从失败中找出解决的办法”,又如: learn by trail and error。mistake意为“错误”;success意为“成功”;