你arrive应该是arrived吧?
意思是,当他们到达机场时,他们的那个飞机已经起飞了
这里应该选择A
到达和起飞都是发生在过去的动作,这时先发生的动作可以理解为过去的过去
即过去完成时
那飞机起飞比到达先发生
如果是同时的,也得是was taking off正在起飞
而且一般这种题要表达的意思都是飞机已经起飞,他们耽误了上飞机的情况
when they arrive at the airport,their flight _______ off.A.h
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