By the time Jack returned home from England, his son __________from college. 
#101958
A
graduated
B
has graduated
C
had been graduating
D
had graduated
推荐题目
The old man was taking a walk, ____ by his grandson. 
#104560
A
supporting
B
supported
C
being supported
D
having supported
I got caught in the rain and my suit______. 
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A
has ruined
B
had ruined
C
has been ruined
D
had been ruined