【題目】When Tom knocked at the door, I was busy ________ my homework and my brother was busy ________ a model plane.

A. to do; with B. doing; with doing

C. with; making D. with; to make

【答案】B

【解析】

試題分析：be busy with one's homework忙于做作業(yè)；be busy making a model plane忙于做飛機模型。

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