【題目】Before p an operation on a patient, Dr. Lee always does a series of careful preparations.

【答案】erforming
【解析】句意:在給一個(gè)病人動手術(shù)以前,Dr. Lee總是做一系列的細(xì)心準(zhǔn)備。before doing sth."做某事之前",所以答案是performing。

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