Question

I.单项选择(每小题2分，共20分)

1. —Why didn't he catch the bus yesterday?

—By the time he got to the bus stop,the bus

already.

   A. was;leaving   B. has;left

   C. would;leave   D. had;left

Answer 1

l.D考查动词的时态。由答语句意“他到达车站时，公 交车已经开走了。”可知，主句用过去完成时。