【题目】 When and where this took place _____ still unknown.
A. is B. has
C. were D. are
在线课程【答案】A
【解析】
试题分析：考查系动词。句意：这个发生在何时何地还不清楚。主语从句作主语，谓语动词用单数形式，故选A。
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When and where this took place still unknown.A. is B. hasC. were D. are
编辑：chaxungu时间：2026-04-27 03:04:24分类：高中英语题库
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