答案：D

题目分析：句意：上文，Jim，他想知道些什么？下文，我什么时候能够写完报告。强调句的特殊疑问句“特殊疑问词 + is / was + it that…？” 用强调句型的特殊疑问句形式来做know的宾语从句，宾语从句用陈述语序。完整的回答应是：(He wanted to know) When it was that I could finish the report. 所以选D。