On the _____ of the theory he worked out the problem.
On the _____ of the theory he worked out the problem.
He worked out the math problem f__.
what do you think of the way that he worked out the problem
He worked out the math problem ( )如题
he has worked out the problem.的被动形式
He had worked out the problem when Jim called him
Finally,he worked out the problem.(改为同义句)
The problem is difficult,( )he has worked it out.
I worked out the problem so( )(easy)
They worked out the math problem .
I worked on the problem ____ a long time and I worked it out
I worked on the problem for a long time and I worked it out