I can hardly imagine the difficulty she had enough evidence to prove that she was innocen

I can hardly imagine the difficulty she had enough evidence to prove that she was innocent.
A. collected
B. to collect
C. to have collected
D. collecting

A. collectedB. to collectC. to have collected(答案→)D. collecting解析：考查固定句式。本题中含有have some difficulty （in） doing sth做某事有困难；把the difficulty提前，后面形成定语从句。句意：我无法想象他得到足够的证据来证明她无辜的困难。故D正确。

谢谢了