---Sorry, Professor Smith. I didn't finish the assignment yesterday.
---Oh, you have done it as yesterday was the deadline.
| A．must | B．mustn't | C．should | D．shouldn't |
.More patients＿＿ in hospital this year than last year.
| A．treated | B．have treated | C．had been treated | D．have been treated |
The officers narrowly escaped ___________ in the hot battle.
| A．have killed | B．to kill | C．to be killed | D．being killed |
. ___________ the letter, he went out to post it.
| A．Writing | B．Being writing | C．Having written | D．Written |
. Don't you remember ___________ ?
| A．seeing the man before | B．to see the man before |
| C．saw the man before | D．to have seen the man before |
. People couldn't help ___________ the foolish emperor in the procession.
| A．laugh at | B．to laugh at | C．laughing at | D．laughing on |