— Has he finished his report yet?
— I’m not sure. He _______ the report these days.
| A．has been writing | B．is writing | C．wrote | D．has written |
I really can’t thank you enough， sir. —.
| A．That’s the most I could do | B．I’m glad to have been of help |
| C．No problem | D．With pleasure |
IP addresses are the unique sequence of numbers ______ to each computer, websites or other Internet-connected devices.
| A．to assign | B．assigning | C．assigned | D．being assigned |
— Do you have the time? I’ve got something to tell you.
— Ok, ______ you make your story short.
| A．now that | B．even if | C．so long as | D．in case |
On top of the hill ______, whose style can be traced to the ages of the Roman Empire.
| A．there standing a church | B．does a church stand |
| C．a church stands | D．stands a church |
A warning signal suddenly appeared on the screen of my computer, ______ the computer was being attacked by a certain virus.
| A．indicated | B．indicating | C．to indicate | D．having indicated |