I can’t quite remember ___ you started doing the work.
| A．that is was when | B．when it was that | C．when was it that | D．that was it when |
It was at 10 o’clock last night __________ the visitors finally arrived at Pudong International Airport.
| A．when | B．that | C．before | D．after |
—How many times have you been to China?
—In fact, it is the first time I __________ here.
| A．was | B．am | C．had been | D．have been |
—I missed the first part of the film. It was really a pity.
—You __________ home half an hour earlier.
| A．should go | B．must have gone | C．should leave | D．should have left |
His father told me that he __________ for the United States three days __________.
| A．has left; ago | B．had left; ago | C．left; ago | D．had left; before |
He made a mistake, but he corrected the situation __________ it got worse.
| A．until | B．when | C．before | D．as |