2010 北京 第 23 题 单选题 区分题 2010_北京卷 (英语) $28. It took me a long time before I was able to fully appreciate what they __ for me.$ A. had doneB. didC. would doD. were doing 参考答案A ☆ 收藏不会,直接看解析查看原卷 →