—Whywereyoulateagainthismorning?  —BythetimeIgotoutsid...

問題詳情：

 — Why were you late again this morning?

   — By the time I got outside, the bus _________.

      A. has left                 B. left           left                      leaving

【回答】

C

知識點：動詞時態

題型：選擇題