It s difficult to say-----this portrait was painted by 横线处可以填that吗为什么呢如果填who 那么that不是可以替换who吗。

It's difficult to choose! is your final exam difficult?no,it'sa piece of cake to me.翻译 It's difficult to do sth 还是It's difficult doing sth It's difficult it's difficult for it's difficult to/for有什么区别?it's difficult to和it's difficult for有什么区别?没有上下文喔句型、翻译等方面说吧 It's not difficult ____(learn) to skate. 用It's difficult to do sth.造句 It's difficult to love everyone什么意思 It's difficult to d____ between the two difficult的反义词It·s（ ）to carry It's difficult to find right shoes for his f_____. new,difficult,to,it's,words,remember(连词成句) it's very difficult to understand the english hearing It's difficult to see and hear at the back. Sometimes,it”s difficult to get off有错吗 It's really difficult to _____(education) the children well. It's difficult to see from the surface是什么意思