一 When did the computer crash?
一 This morning, while I the reading materials downloaded from some websites.
| A．have sorted | B．was sorting | C．am sorting | D．had sorted |
The witnesses ________ by the police just now gave very different descriptions of the fight.
| A．questioned | B．being questioned |
| C．to be questioned | D．having questioned |
________ in the early 20th century, the school keeps on inspiring children's love of art.
| A．To found | B．Founding |
| C．Founded | D．Having founded |
________ which university to attend, the girl asked her teacher for advice.
| A．Not knowing | B．Knowing not |
| C．Not known | D．Known not |
George returned after the war, only ________ that his wife had left him.
| A．to be told | B．telling |
| C．being told | D．told |
He got up late and hurried to his office, ________ the breakfast untouched.
| A．left | B．to leave |
| C．leaving | D．having left |