you can't imagine what（）great difficulty we have had working out such （）difficult problem 这里两个空要填什么冠词,difficulty可数吗

you can't imagine what（）great difficulty we have had working out such （）difficult problem
这里两个空要填什么冠词,difficulty可数吗

不填
a
difficulty 既可以是可数的,也可以是不可数的.
做不可数的时候,表示抽象的“困难”,
作可数的时候,表示“困难的事”.
这里强调的是we have had great difficulty,表示抽象的“困难”
后面problem是可数名词.

一空不填
2 a

1.the 2.a/the（特指时用the) difficulty可数，复数形式为difficulties