. It took me a long time before I was able to fully appreciate what they for me. A. had done ——青夏教育精英家教网—

摘要：. 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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（北京卷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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