The chair looks rather hard _______, but in fact it is very comfortable.
| A．to sit | B．to sit on | C．sitting | D．sit |
It was not a long time___we realized the truth
| A．when |
| B．until |
| C．since |
| D．before |
I cannot understand why Libya will become so complicated___I understand more from the medium
| A．after |
| B．before |
| C．while |
| D．when |
Several weeks had gone by___he realized the painting was missing
| A．as |
| B．before |
| C．since |
| D．when |
The thief___her purse and ran away
| A．picked |
| B．selected |
| C．snatched |
| D．elected |
He said that the film is worth___a third time
| A．to see |
| B．to be seen |
| C．being seen |
| D．seeing |