Computers in offices and homes since 1970s．
#101154
A
have been used
B
had been used
C
was
D
has been used
推荐题目
-- Have you moved into the new house? -- Not yet. The rooms _______.
#103539
A
are painting
B
are being painted
C
are painted
D
are being painting
Mr. Johnson insisted that he _____ his debts, but nobody believed him.
#103363
A
pay
B
pays
C
paid
D
had paid
I'm tired out. I all afternoon and I don't seem to have finished anything.
#100550
A
shopped
B
have shopped
C
had shopped
D
have been shopping
We were told to have our reading room_____ after school.
#103240
A
clean
B
to clean
C
cleaning
D
cleaned