—Didyoucatchtheschoolbusthismorning?  —No.BythetimeIarr...

问题详情：

— 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

知识点：动词时态

题型：选择题