—Didyoucatchtheschoolbusthismorning?  —No.BythetimeIarr...

問題詳情：

— Did you catch the school bus this morning?

   — No. By the time I arrived at the bus stop, it _______ already _______.

    A. was; leaving          B. has; left          C. had; left

【回答】

C

知識點：動詞時態

題型：選擇題