I think you must be mistaken about seeing him at the theatre; I’m sure he abroad all week.
| A．is | B．was | C．has been | D．had been |
Who ________ that played a trick on the new English teacher?
| A．it was | B．was it |
| C．he was | D．was him |
Where do you think ________ we can buy that bestseller?
| A．it is that | B．is it that |
| C．that | D．it |
There is no doubt that eating organic food will make you healthier, ________？
| A．will it | B．does it |
| C．is there | D．is it |
It was today's activity ________ let me know the importance of teamwork.
| A．where | B．which |
| C．that | D．what |
—Why wasn't John hired for the job?
—I don't know, but he ________.
| A．was | B．had been |
| C．should have | D．should have been |