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It could only get over the mountains if it rose to ten thous

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It could only get over the mountains if it rose to ten thousand feet.
if后面是动词过去式,这是非真实条件句吗?could 起什么作用?
It could only get over the mountains if it rose to ten thous
我不觉得是非现实条件句.
They soon ran into serious trouble.At one point,it seemed certain that their plane would crash.It could only get over the mountains if it rose to ten thousand feet.Byrd at once ordered his men to throw out two heavy food sacks.The plane was then able to rise and it clared the mountains by four hundred feet.
首先整片文章都是在讲过去的事情,用的都是过去时.
第二点,你看这句话的前面一句:At one point,it seemed certain that their plane would crash.在某一处山峰,看上去他们的飞机一定会坠毁了.
所以接下去的这句话的意思,我不觉得是非现实的.
最后一点,如果你在一个过去时态的文章里要表现虚拟语气,你得用过去完成时,对吧.
could这里,只是解释为“能够”的意思而已