你的分析没错, 应该是have trouble in doing(其中的in可以省略)

解这类题目,首先要弄清句子结构,只要结构清楚了,就容易判断了.

主谓宾: you never imaginewhat great trouble

定从:I have____this paper in my house.修饰 trouble

如将定从还原,就是: I have ...great trouble __ this paper in my house.

因此此题考查: have trouble in doing...,而不是考查:imagine doing