--WhatisBilldoing?--Heisbusy________ahorse.A.drawB.todrawC.drawingD.todra

发布时间：2020-08-06 20:17:07

--What is Bill doing?--He is busy ________ a horse.A.drawB.to drawC.drawingD.to drawing

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C解析考查结构be busy doing sth。
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