【题目】--- Is this company ______ your elder sister once worked in?
---- Yes, it is.
A. where B. which C. the one D. that
在线课程【答案】A
【解析】
试题分析：考查表语从句。句意：这家公司是你姐姐曾经工作的地方吗。句子的主语this company，谓语动词is，表语从句____ your elder sister once worked in 缺少状语，故选A项。
考点 : 考查表语从句