You can’t imagine 是主语,你不能想象,难以想象
what great trouble they have 是一个感叹结构,把它先变为正常句子结构,即：they have great trouble ..,他们.有着很大困难,后面跟(in) doing（in可以省略）
所以第一个空格填写solving
the problem 问题是“被讨论的”应该用被动语态,being discussed意思是“正在被讨论的”（被动语态的进行时）
所以综上所述,只有D是正确的
You can't imagine what great trouble they have _____ the pro
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