【题目】Before p an operation on a patient, Dr. Lee always does a series of careful preparations.
在线课程【答案】erforming
【解析】句意：在给一个病人动手术以前，Dr. Lee总是做一系列的细心准备。before doing sth."做某事之前"，所以答案是performing。
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Before p an operation on a patient, Dr. Lee always does a series of careful preparations.
编辑：chaxungu时间：2026-04-27 03:14:54分类：高中英语题库
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