这句话错误,不该是be,而应该是was,be是be动词原形.不能直接使用作谓语
因为蒸汽做火车动力是过去的事情.所以使用一般过去时
For many years the motive power of train was steam.好多年,火车的动力是蒸汽.
For many years the motive power of train be steam这里面为什么用be
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