一、单项选择(共20小题;共20分)
1. --- I saw Dave in the lift this morning.
--- Really? He around here for a long time.
A. won't be seen B. wasn't seen
C. hasn't been seen D. hadn't been seen
2. --- Look! Somebody the sofa.
--- Well, it wasn't me. I didn't do it.
A. is cleaning B. was cleaning C. has cleaned D. had cleaned