You can’t imagine what great trouble they have _____ the pro

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You can’t imagine what great trouble they have _____ the problem _____.
选项:a、to solve/being talked about b、 solving/ discussing
c、 to solve/ to talk about d、 solving/being discussed
选哪个?为什么?请分析并翻译整句

d
they have是定语从句,修饰trouble,所以可以用括号括起来,
have trouble (in) sth/doing sth,而problem是被讨论
你无法想象他们在解决这个正被讨论的问题中有多大的麻烦

You can't imagine what great trouble they have _____ the pro You can’t imagine what great trouble they have _____ the pro you can't imagine what great trouble they have solving the p You can't imagine wahat great trouble they have solving____t You can't imagine wahat great trouble they have____the probl You can never imagine what great trouble I have You can’t imagine what great trouble the boy has ______his f You can’t imagine what great trouble the boy has persuading we can't imagine what great difficulty they have ____ the pr You can never imagine what great trouble I have had _____the 尤其是语法）You can never imagine what great trouble I had ( )the You can hardly imagine the great trouble I took___your house