Question

we can't imagine what great difficulty they have ____ the problems in the plan.

A to settle B settling C settled D to be settled
答案是C 为什么 怎样翻译
那么the problems in the plan 是什么成分，是谁的宾语

Answer 1

C settled

we can't imagine what great difficulty they have __settled__ the problems in the plan.

我们简直不能相象他们为完成计划克服了多大的困难。

后面what great difficulty they have __settled__ 是一个感叹句式，其实是they have __settled__ great difficulty.

Answer 2

答案不可能是C。一定是弄错了。
正确答案应该是B。
考察的是have difficulty (in) doing 的结构。
difficulty后面引导了一个定语从句，difficulty是先行词，还原到定语从句中是：they have great difficuly (in) settling the problems
我们无法想象他们在解决这个问题的时候遇到的多么大的困难。