It was not until the teacher had explained it three times _______ how to work out the problem.
| A．did he understand | B．had he understood |
| C．that he understood | D．that he didn’t understood |
The CEO of the company is a position ____ many abilities are required to deal with all types of problems.
| A．which | B．that | C．when | D．where |
You'd better check the train schedule______ .we have to take a train to Chengdu.
| A．even if | B．as if |
| C．incase | D．as long as |
For some students, professional training might be the way to go since well-developed skills, _______ , can be the difference between having a job and not.
| A．all other factors are equal |
| B．all other factors to be equal |
| C．all other factors being equal |
| D．if all other factors being equal |
After ________seemed an endless wait, it was his turn to enter the personnel manager's office.
| A．that | B．it | C．what | D．there |
Hardly ______ when I regretted saying it.
| A．had the word come out | B．did the word come out |
| C．the word had come out | D．the word came out |