Can you imagine the difficulty I^^^Can you imagine the difficulty I had __settling___ these problems?why "settled" can't?

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Can you imagine the difficulty I^^^Can you imagine the difficulty I had __settling___ these problems?why

Can you imagine the difficulty I^^^Can you imagine the difficulty I had __settling___ these problems?why "settled" can't?
Can you imagine the difficulty I^^^
Can you imagine the difficulty I had __settling___ these problems?
why "settled" can't?

Can you imagine the difficulty I^^^Can you imagine the difficulty I had __settling___ these problems?why "settled" can't?
因为将句子还原后是I have the difficulty in doing
have difficulty/difficulties in doing sth
have (some) trouble in doing sth
这都是固定句型

in out
have difficulty in doing 做某事有困难

这两个空分别填in和up
have difficulty in doing 做某事有困难 ,这是固定词组
settle up 解决

__settling___ these problems修饰the difficulty I had
I 对于these problems是主动
所以用现在分词
have difficulty (in) doing
两种理解,还是看语感吧