Charles entered New York University in 2009 and one year later ________to University of London as an exchange student.
| A．sent | B．had sent | C．was sent | D．had been sent |
—What's the matter with Philips?
—Something must have happened to him. He left home three hours ago, but ________ at the party!
| A．didn't arrive | B．isn't arriving |
| C．hadn't arrived | D．hasn't arrived |
If this product does not give you complete satisfaction, please return it to the manufacturer, stating when it ________.
| A．is purchased | B．will be purchased |
| C．purchases | D．has purchased |
—David, are you listening to me?
—Sorry, Dad. I ________ to make sense of what the reporter said.
| A．was trying | B．have tried |
| C．am trying | D．tried |
—Look! Someone ________ the floor.
—Well, it wasn't me. I went shopping just now.
| A．had swept | B．has swept |
| C．was sweeping | D．is sweeping |
It's said that they ________ a better life ever since they moved to the US.
| A．had enjoyed | B．have been enjoying |
| C．were enjoying | D．would enjoy |