We_______on this project for four hours. Let’s have a rest.
#103758
A
are working
B
have been working
C
worked
D
had worked
推荐题目
 You __________ to leave until you __________ your work.   
#102260
A
won’t be allowed; have finished
B
won’t allow; finish
C
won’t be allowed; will finish
D
won’t allow; will finish
—Bob has gone to California.—Oh, can you tell me when he        ?
#101937
A
has left
B
left
C
is leaving
D
would leave