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you can't imagine what()great difficulty we have had working

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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
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.