试题题干
Directions: Read each of the following sentences carefully, and choose A,B,C or D that has the closest meaning to the underlined word or phrase.
By trial and error, we finally got the machine to work.（）
参考答案
正确答案：
试题解析
By making mistakes 通过试错；By trial and error 试错法。
经过反复试验，我们终于使机器运转起来了。