—John, why are you so tired?
—I ______ pingpong with Jimmy.
| A．play | B．played | C．have played | D．have been playing |
There is some doubt ____ the sick schoolboy can join in the English evening party on Sunday.
| A．/ | B．whether | C．that | D．which |
---- How long ____ at this job?
---- Since 1990.
| A．were you employed | B．have you been employed |
| C．had you been employed | D．will you be employed |
___ I know he will stay here for half a year.
| A．as soon as | B．as long as | C．so far as | D．as well as |
_____ the government agrees to give extra money , the theatre will have to close.
| A．Until | B．Unless | C．Since | D．While |
----Iam sorry to have ____ too much of your time.
----That's OK, and I am glad to help you.
| A．taken up | B．taken on | C．taken off | D．taken in |