题目内容
【题目】The painter was busy （调配，混合）his colours.
【答案】mixing
【解析】mixing 固定词组：be busy doing sth.忙着做某事，故填mixing。
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题目内容
【题目】The painter was busy （调配，混合）his colours.
【答案】mixing
【解析】mixing 固定词组：be busy doing sth.忙着做某事，故填mixing。