This problem was very difficult.Lily couldn't ____
This problem was very difficult.Lily couldn't ____
This problem was so difficult they couldn't solve them.改写句子
This problem was much more difficult than i ____ (expect).
I gave that boy so difficult a math problem ____ he couldn’t
The math problem was so difficult that I couldn't work it ou
The problem was so difficult that we couldn't work it out ea
the question was not very difficult,but he _____ couldn't an
this problem is very difficult,but i want to have a 什么(以t开头)
The math problem was very difficult that few students could
Tom was ______ that he couldn’t understand ______ difficult
This problem is ( ) difficult ( ).第一空为什么不能用very
this is the problem very difficult to solve