---- 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
----I am 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
Mary and her friends paid_____visit to _______Summer Palace yesterday.
A. the; / B.a; the C.a; / D. the; a
It was back home after the experiment.
A. not until midnight did he go B. until midnight that he didn’t go
C. not until midnight that he went D. until midnight when he didn’t go
