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
——You see how thin Ann is!——She ______ gain some weight but she______ too little.
#99970
A
would; ate 
B
will ; eats 
C
would ; has eaten 
D
will ; is eating
—I’m not finished with my dinner yet.—But our friends      for us.
#101664
A
will wait
B
wait
C
have waited
D
are waiting
The first edition             in 1955 and         a best seller ever since.
#101874
A
was published; had been
B
had been published; had been
C
has been published; has been
D
was published; has been