— That’s the third time he’s won the award in this field.
— Yes. He ______ his maximum potential in the past decade.
| A．has been exploring | B．is exploring |
| C．had explored | D．explored |
_______ human beings use it in a wrong way, like we did with nuclear technology, the advancement of science and technology has never led to decline of human development.
| A．While | B．Unless |
| C．As long as | D．Before |
—I’m afraid the project may be several days behind schedule due to bad weather.
—Don’t worry. Three more assistants will be _______ in no time at all.
| A．at your convenience | B．at your command |
| C．at your risk | D．at your request |
Ding Junhui plays _______ Gary Wilson in the semifinal of the 2015 World Snooker China Open in Beijing, April 4, 2015.
| A．over | B．for | C．against | D．with |
—Mum, Dad ought to stop working?
—Yes, he has a bad headache because he _______ too long.
| A．read | B．has been reading |
| C．had read | D．is reading |
After the death of her mother, the girl was sold to a rich man just in the neighboring area, from _______ house she tried to escape twice.
| A．whom | B．his | C．whose | D．which |