楼上说得不正确,这道题考的是过去完成时,过去完成时的意思是,发生在过去之前的事,这道题应该这样做：在那个早晨,这封信已经被送到了.
过去完成时,是指：一个动作发生在过去某个动作之前.
这题改怎么选The letters______that morning.A.were delivered B.deliv
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