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【题目】他们正在讨论把墙涂成什么颜色。

【答案】They are discussing what colour to paint the wall.
【解析】表示“正在讨论”用现在进行时be doing,主语“他们”用代词they表示,是复数形式,故谓语用are discussing。what color什么颜色,paint the wall涂墙;作为动词discuss的宾语,可以是“疑问词+动词不定式”的短语。故此处为They are discussing what colour to paint the wall.

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