.
My parents would have come to see you if it had been possible, but they ________ so busy.
| A．were | B．had been | C．have been | D．would be |
By the time he realizes he ____ into a trap, it’ll be too late for him to do anything about it.
| A．walks | B．walked | C．has walked | D．had walked |
--- I’m sure Andrew will win the first prize in the final.
--- I think so. He ___________ for it for months.
| A．is preparing | B．was preparing |
| C．had been preparing | D．has been preparing |
–What’s that noise?
–Oh, I forgot to tell you. The new machine ______.
| A．was tested | B．will be tested | C．is being tested | D．has been tested |
—I’m sure Andrew will win the first prize in the final.
—I think so. He ___________ for it for months.
| A．is preparing | B．was preparing | C．had been preparing | D．has been preparing |
I don’t believe you’ve already finished reading the book — I ______it to you this morning!
| A．would lend | B．was lending | C．had lent | D．lent |