题目内容
【题目】Before p an operation on a patient, Dr. Lee always does a series of careful preparations.
【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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题目内容
【题目】Before p an operation on a patient, Dr. Lee always does a series of careful preparations.
【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。