— Why didn't you stop her going swimming alone?
— She had left the room _____ I had time to do it．
| A．after | B．before | C．till | D．as |
You can borrow my car___you promise not to drive too fast
| A．unless |
| B．even if |
| C．in case |
| D．as long as |
All the photographs in this book,___stated otherwise,date from the 1950s
| A．unless |
| B．until |
| C．once |
| D．if |
Hot___the night air was,we slept deeply because we so tired after the long journey
| A．although |
| B．as |
| C．while |
| D．however |
A number of high buildings have arisen___there was nothing a year ago but ruins
| A．when |
| B．where |
| C．before |
| D．until |
When the disabled sportman won a gold medal,a lot of people___him on his success
| A．appreciated |
| B．approved |
| C．congratulated |
| D．remarked |