They studied what ______ since 2007 and found Australian electricity prices were among the highest in the developed world.
| A．has happened | B．happened | C．had happened | D．has been happening |
.
--- Could I use your dictionary?
--- ________________.
| A．Go ahead, help yourself, please | B．Yes, you could |
| C．With pleasure | D．It doesn’t matter |
.
It’s necessary to be prepared for a job interview. ________ the answers ready will be of great help.
| A．To have had | B．Having had | C．Have | D．Having |
.
The police found that the house ________ and a lot of things ______
| A．had broken into; had been broken | B．had been broken into; stolen |
| C．has been broken into; stolen | D．has been broken into ; has bee broken |
.
--- It’s already 9:00 o’clock, but he hasn’t turned up yet.
--- He ______ in the traffic jam.
| A．could have caught | B．should have caught |
| C．must catch | D．would have caught |
.
_______ of such a long and boring meeting, the little turned to his favorite music on MP3.
| A．Having tired | B．Tiring | C．To tire | D．Tired |