1. --- Why was he late for school yesterday?
--- He overslept. By the time he got to the bus stop, the bus already .
A. was; leaving B. has; left C. would; leave D. had; left
2. The new suspension bridge by the end of last month.
A. has been designed B. had been designed
C. was designed D. would be designed
3. By the end of the last month, I all the CDs Of Just in Bieber.
A. collect B. collected
C. have collected D. had collected
