The assistant explained there were several doubtful points in the scheme he difficult to understand.

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编辑：chaxungu时间：2026-04-27 03:01:19分类：高中英语题库

【题目】The assistant explained there were several doubtful points in the scheme he _______ difficult to understand.

A. was finding B. would find

C. had found D. has found

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【答案】C

【解析】

试题分析：句意：助手解释道，方案中有几个疑点他觉得难以理解。动作find发生在explained之前，应用过去完成时。故选C项。