-Coach, can I continue with the training?
-Sorry, you can't __________ you haven't recovered from the knee injury.
| A．until | B．before |
| C．as | D．unless |
In the last few years thousands of films ______ all over the word.(2011.天津)
| A．have produced |
| B．have been produced |
| C．are producing |
| D．are being produced |
The new dictionaries are very useful. They ______well and ______ already.
| A．sell; have been sold out |
| B．sold; had sold out |
| C．sell; sell out |
| D．are sold; have been sold out |
Every possible means ______ to save the woundedsoldier up to now.
| A．was tried |
| B．were tried |
| C．have been tried |
| D．has been tried |
Though we don't know what was discussed, yet wecan feel the topic ________.
| A．had changed |
| B．will change |
| C．was changed |
| D．has been changed |
His sister left home in 1998, and ______ since.
| A．had not been heard of |
| B．has not been heard of |
| C．had not heard of |
| D．has not heard of |