the problem is very difficult,but he worked it out ____ a last b end c finally

问题描述:

the problem is very difficult,but he worked it out ____ a last b end c finally
the problem is very difficult,but he worked it out ____ .
a last b end c finally

你想选A请在题目加一个at 如果你想选B请在题目加一个at the题就是这样子的啊我是说 这题选第三个 如果你想知道为什么不选第一个 因为第一个少了一个at 如果你不明白为什么不选第二个 因为第二个少了at the 只要加上这些A B都是正确选项