the worker was very sorry for the trouble he had put his manager____the problem
a.to solve b.solving c.of solving d.to of solving
问题补充：.....答案我知道，选D， 我想知道原因。。。。为什么呢
for是引导原因状语从句吗？the trouble 是倒装吗？为了强调trouble吗？谢谢各位