It ______ three years since I left England.
| A．has been | B．was | C．had been | D．will be |
My neighbour’s dog is fierce and dangerous, so I think he ought to keep it in the yard _____ it attacks any more children.
| A．until | B．since | C．when | D．before |
Many approaches have been _____ to control the spread of the terrible virus “Ebola” so far.
| A．occupied | B．defended | C．employed | D．settled |
The failure of their friendship was closely related _____ other people’s privacy.
| A．to not his respecting | B．to his not respecting |
| C．his not to respect | D．his not to respecting |
—Will Jane join in our party tonight?
—Yes, but I’d rather she _____.
| A．wouldn’t come | B．hadn’t come |
| C．didn’t come | D．weren’t to come |
These trees must have been planted three years ago, _____?
| A．mustn’t they | B．weren’t they |
| C．didn’t they | D．haven’t they |