I was on the highway when this car went past fol. Lowed by a police car. They ______ at least 150 kilometers an hour.
| A．should have been doing | B．must have been doing |
| C．could have done | D．would have done |
For more information about Cambridge, _____ our website at www. Cambridge, org.
| A．visit | B．visiting | C．to visit | D．visited |
——Did you find the missing couple in the mountain yesterday?
——No, but we _____ to get in touch with them ever since.
| A．have tried | B．have been trying | C．had tried | D．had been trying |
I think you should go back to your _____ plan, which is much more practical than the present one.
| A．random | B．original | C．abstract | D．ridiculous |
——Jim is addicted to novels recently.
——Yes, that might _____ why he did so badly in the last test.
| A．answer for | B．apply for | C．account for | D．call for |
I was surfing the Internet _____of successful rendezvous and docking of Shenzhou-VIII and Tiangong-I.
| A．when suddenly came the good news |
| B．while the good news came suddenly |
| C．when suddenly did the good news come |
| D．while suddenly came the good news |