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

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A. collected
B. to collect
C. 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。