By the time Jack returned home from England, his son.      from college.
#102659
A
graduated
B
has graduated
C
had been
D
had graduated
推荐题目
Don’t you know sweaters can’t ________ that way?
#103795
A
being washed
B
be being washed
C
wash
D
be washed
The student didn’t pay any attention to the lecture; he ________ of something else. 
#104749
A
thought
B
had thought
C
would think
D
was thinking
Would you please keep silent? The weather report ________ and I want to listen.
#100935
A
is broadcasted
B
is being broadcast
C
has been broadcasted
D
had been broadcast