Computers ____ in offices and homes since 1970s. 
#100256
A
have been used
B
had been used
C
was used
D
has been used
推荐题目
At 4:00 next Friday, I ________TV in my room.
#103609
A
will watch
B
will be watching
C
will have watched
D
will been watching
—Jim came back home last night. —Really? Where ________ at all?
#104472
A
had he been
B
has he been
C
had he gone
D
has he gone
We______our breakfast when an old man came to the door.
#104557
A
just have had
B
have just had
C
just had
D
had just had
Since the sales promotion, all the items _______well.
#99200
A
have been sold
B
were sold
C
had sold
D
have been selling