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高中英语情态动词题Has Tim started?He said he would join theparty.-He(

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高中英语情态动词题
Has Tim started?He said he would join theparty.-He( ).He is a man of his word.1could have left2must have left3can't come4won't be coming怎么翻译?选哪个?为什么?
高中英语情态动词题Has Tim started?He said he would join theparty.-He(
2must have left是正确答案.肯定推测用must,推测过去的事时后加have done.
汤姆动身了吗?他说过他会参加这个聚会的.他肯定已动身了,他是个说话算话的人.