Question

【题目】—How much difficulty did you have ________ (solve) the problem?

—None. It’s very easy.

Answer 1

【答案】solving

【解析】

句意：——解决这个问题你有多少困难？——没有，它很简单。

此处用的是固定结构have difficulty (in) doing表达“做某事有困难”，此处用solve的动名词solving。故答案为solving。