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把下列句子改写成被动语态
They had conducted experiments of this kind well before the Second World War.
Experiments of this kind had been conducted well by them before the Second World War.
Experiments of this kind had been conducted well by them before the Second World War.

【答案】Experiments of this kind had been conducted well by them before the Second World War.

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发布：2024/5/23 20:38:36组卷：2引用：2难度：0.9

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把下列句子改写成被动语态They had conducted experiments of this kind well before the Second World War. Experiments of this kind had been conducted well by them before the Second World War.Experiments of this kind had been conducted well by them before the Second World War.