The problem was very difficult ______(solve).
this is the problem very difficult to solve
The math problem was very difficult that few students could
He tried his best to solve the problem,______ difficult it w
The problem is difficult ______.
the math problem is _____ difficult for me ____ solve
_____(解决) the difficult problem.(不是solve)
but he found the problem difficult to solve
The problem is very difficult to ( )
It was very difficult for me to work out the math problem.同义
快...1.The math problem was very difficult for him,but he ___
it was very difficult for him to work out the problem改为同义句
it was very difficult for him to work out the problem 改为同义句