如下:The exercise is very difficult.We can't work it out.(合并为一
如下:The exercise is very difficult.We can't work it out.(合并为一
The problem is very difficult.He can't work it out.(合并为一句)
the problem is very difficult.we can't work it out.(合并)the p
the problem is very difficult.we can't work it out.(合并一个句)th
The problem is very difficult.We can't work it out.(51.合并)
The problem is very difficult.We can't work it out.The probl
The question is very difficult. we can't answer it合为一句
the problem is very difficult ,You can't work it out------ -
THE problem is very diffcult.he can't work it out .(合并)
the problem is so difficult( ) we can't work it out
The problen is difficult.I can't work it out.
It is very hot today.We can't go out for a walk.(合并为一句)