_______ from other continents for millions of years, Australia has many plants and animals not found in any other country in the world.
| A．Being separated | B．Having separated |
| C．Having been separated | D．To be separated |
---May I open the window to let in some fresh air?
---_______(2009．四川)
| A．Come on! |
| B．Take care! |
| C．Go ahead ! |
| D．Hold on! |
I don't suppose anyone will agree with you,_______?
| A．will they |
| B．don't they |
| C．won't they |
| D．do they |
Yesterday she sold her bike, _______ she bought a year ago.
| A．when |
| B．where |
| C．that |
| D．which |
There is no light in dormitory. They must have gone to the lecture,_______ ?
| A．didn't they |
| B．don't they |
| C．mustn't they |
| D．haven't they |
Sarah had her washing machine repaired the day before yesterday,_______ she? (2006 .广东)
| A．had |
| B．did |
| C．hadn't |
| D．didn't |