by the time i got there ,the bus had left.为什么后半句要用现在完成时?

by the time i got there ,the bus had left.为什么后半句要用现在完成时? by the time I got outside, the bus had already left是什么句 outside,bus,the,already,time,I,left,the,by,got,had Unit10 By the time I got outside,the bus had already left. By the time I got outside,the bus had already left 这是什么时态啊 he had left by the time I got there.的意思 Mary told me that he had left by the time i got there的意思 求一篇by the time l got outside,the bus had already left.的作文. ( by ) the time I got to the bus stop .the bus had already l When I got to the bus stop ,the bus had left ___the bus left ____by the time I got to the bus stop. By the time I got to the bus stop,the bus already