Just as the train was____,they saw it.这个空的正确答案是to leave,为什么不是leaving?

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Just as the train was____,they saw it.这个空的正确答案是to leave,为什么不是leaving?
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Just as the train was____,they saw it.这个空的正确答案是to leave,为什么不是leaving?
Just as the train was____,they saw it.这个空的正确答案是to leave,为什么不是leaving?

Just as the train was____,they saw it.这个空的正确答案是to leave,为什么不是leaving?
to leave其实是缩写了,完整的写是about to leave,表示车马上就要开走了.此处省略about.

to leave表示火车离开的过程 leaving表示离开的这个结果 根据后文他们看见 如果是离开这个结果就不存在看不看得到了 所以是过程 (望采纳!)

to leave 要离开, leaving ,正在离开 saw it ,那一刻, just as ,都表示 那一刻, 用延续性的leaving 不合适