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試卷：99年 - 2010年北京高考真题（英语）#13317 | 科目：高考◆英语◆北京市

試卷名稱：99年 - 2010年北京高考真题（英语）#13317

年份：99年

科目：高考◆英语◆北京市

28. It took me a long time before I was able to fully appreciate what they __ for me.
(A) had done
(B) did
(C) would do
(D) were doing

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