—The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
—Oh, dear! She _______ a lot of difficulties!
| A．may go through | B．might go through |
| C．ought to have gone through | D．must have gone through |
—Do you think Mom and Dad________late?
—No，Swiss Air is usually on time.
| A．were | B．will be |
| C．would be | D．have been |
Shakespeare’s play Hamlet________into at least ten different films over the past years.
| A．had been made | B．was made |
| C．has been made | D．would be made |
We ________ very early so we packed the night before.
| A．leave | B．had left |
| C．were leaving | D．have left |
If we________now to protect the environment，we’ll live to regret it.
| A．hadn’t acted | B．haven’t acted |
| C．don’t act | D．won’t act |
When I first met Bryan I didn’t like him，but I________my mind.
| A．have changed | B．change |
| C．had changed | D．would change |