He is busy to work out the difficult problem. 改错
He is busy to work out the difficult problem. 改错
He found it difficult to work out the problem.
The problem is difficult for me to work out.
it is difficult to work out the problem 对work out the proble
the problem is too difficult for us to work out中的work out为什么
Waht a b____ boy he is!He can work out the difficult problem
The problem is very difficult.He can't work it out.(合并为一句)
he is only student _____can work out the difficult problem i
____,he can not work out the difficult problem
(),he can not work out the difficult problem
He found () difficult to work out the problem in such a shor
I found it difficult to work out the problem without your he