第二部分：强化题
We haven’t settled the question of _______ it is necessary for him to study abroad.（2006年江苏省高考题）
| A．if | B．where | C．whether | D．that |
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 |
I was wandering through the street ________a beggar stopped me for some money.
| A．when |
| B．while |
| C．unless |
| D．since |