the problem is very difficult,but he worked it out ____ a la

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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
再问：题就是这样子的啊
再答：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

the problem is very difficult,but he worked it out ____ a la The problem is difficult,____,he has worked it out.A:though The problem is difficult,（）he has worked it out. The problem is difficult ,but he worked it out____. The problem is very difficult.He can't work it out.(合并为一句） The maths problem is difficult,but f___we work it out. I worked on the problem ____ a long time and I worked it out The problem is a bit difficult ,but he can ( ) to work it ou 改错This math problem is very difficult but I can work out it. it is a difficult problem,but tom can___ work it out.A.only The problem is very difficult.We can't work it out.The probl the problem is very difficult.we can't work it out.(合并）the p