求解一道SAT改错题In the early days of the steam locomotive,compassi

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求解一道SAT改错题
In the early days of the steam locomotive,compassionate engineers would sometimes 【have thrown】coal overboard in poor neighborhoods.
have thrown 为什么错了

would 后面应该接动词原形,would do 表示的是一种过去的习惯.而would have done 是一个虚拟语气,用在句型：If i had done something, I would have done something 中.

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