Dr.Bethunewasbusy________thewounde

发布时间：2020-07-26 06:31:42

Dr. Bethune was busy ________ the wounded soldiers.A.operating onB.operate onC.operate atD.to operate in

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A解析be busy doing sth．“忙于做……”后面接动词-ing形式；“给某人动手术”后面应该用介词on。
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