改写句子 i hear it is difficult for them to deal with the problemsi hear that they have _ _the problem两个空

填写：difficult to solve
同样表达：我听说解决这个问题对他们来说有点困难。

那就是填写：difficulty in了

difficulties to deal with
用名词即可

I hear that they have difficulties to deal with the problems.

i hear that they have trouble in the problem.
我不确定昂，
不过按照以往经验，
这种填空，应该来自书上的短语。
是不是课后练习里面的？~