语法题都忘光了....Be 后面跟序数词,后面就要to do .He was the last one to leave the classroom.She was the first one to reach the airport.至于你说的介词和宾语的复杂关系,我也有点头晕.其实我觉的不用搞的这么明白,主要词组用法和基本语法掌握了就行了.To do 或者to doing 才是重点~
