The moment I got back to the classroom, I found I _______ my jacket on the playground.
| A．left | B．had left | C．have left | D．was leaving |
It's reported that a plane with five people ________crashed into the mountain several days ago.
| A．on board |
| B．on the board |
| C．in board |
| D．in the board |
He was just about to give up hope，________a good idea came into his mind.
| A．when |
| B．while |
| C．as |
| D．since |
I was telling them about my tour ________she broke in with her own story about her visits to Beijing.
| A．after |
| B．when |
| C．as |
| D．before |
Hardly had we entered the room________ it began to rain.
| A．while |
| B．as |
| C．then |
| D．when |
—When did the computer crash?
—This morning，while I ________ the reading materials downloaded from some websites.
【选项
| A．have sorted |
| B．was sorting |
| C．am sorting |
| D．had sorted |