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 first decade in the 21st century _______ the rapid rise of China as a world economic power.
#102847
A
witness
B
has witnessed
C
will witness
D
have witnessed
The people _____ the murderer everywhere when he suddenly _______ in the hospital.  
#102316
A
searched for; appeared
B
were searching; was appearing
C
were searching for; was appeared
D
were searching for; appeared