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题目
He described where they had landed and told how they were moving across the USA
为什么前面是过去完成时,而后面是过去进行时they were moving across

提问时间:2020-11-11

答案
 had landed 是相对谓语described 来说的,由于先于described 发生,过去的过去,所以是过去完成时
were moving 侧重陈述过去的某一特定时候的情景,状态,所以用过去进行时
简单点说.用过去完成时,表示在过去某一特定事件以前做过某事
                   用过去进行时则表示在过去某一特定时间在做的事
 
 
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