The trip will take about five months；it will be a long time ________ we meet them again.
| A．after | B．before | C．since | D．when |
They urged that the library __________ open during the vacation.
| A．was kept |
| B．would be kept |
| C．is kept |
| D．be kept |
The soldier raised his gun and calmly __________ it at the enemy commander, fired.
【选项 】
| A．aiming |
| B．aimed |
| C．to aim |
| D．aim |
People still lack knowledge about what can be recycled and what cannot, especially when it comes to __________ kitchen garbage.
【选项 】
| A．sort |
| B．sorting |
| C．sorted |
| D．having sorted |
The first decade in the 21st century __________ the rapid rise of China as a world economic power.
| A．witness |
| B．has witnessed |
| C．will witness |
| D．have witnessed |
__________ the city centre, we saw a stone statue of about 10 metres in height.
| A．Approaching |
| B．Approached |
| C．To approach |
| D．To be approached |