Ladies and gentlemen, due to an unexpected accident, one of the singers who all of you to hear____tonight,
| A．had come; don't perform |
| B．come; won't perform |
| C．have come; won't be performing |
| D．came; wouldn't perform |
As it tuned out to be a small house party, we ____ so formally.
| A．needn’t dress up | B．couldn’t have dressed up |
C．didn’t need dress up | D．needn’t have dressed up |
— 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 |
To be on the safe side, we should fill up the tank now, because we ______ run out of gas on the way.
| A．can | B．would | C．might | D．should |
There used to be a small school,___________?
| A．was there | B．wasn’t it | C．usedn’t there | D．usedn’t it |
The two strangers talked as if they ____ friends for years.A should be B would be C have been D had been