. With the development of science, more new technology____ to the field of IT.
| A．is being introduced | B．has introduced |
| C．is introducing | D．was introduced |
A computer is so useful a machine ________ we can use everywhere.
| A．that | B．which | C．as | D．what |
— Why didn’t you come to Mike’s birthday party yesterday?
— Well, I ____, but I forgot it.
| A．should | B．must | C．should have | D．must have |
It was quite a serious accident, _____caused by careless driving.
| A．which I think was | B．I think which was |
| C．which I think it was | D．I think which it was |
Jane was disappointed that most of the guests_______when she _____at the party.
| A．left; had arrived | B．left; arrived |
| C．had left; had arrived | D．had left; arrived |
The politician has been warned that he would be getting into great trouble_____stick to his standpoint.
| A．were he to | B．he will | C．he was to | D．would he |