By the time Jack returned home from America, his son __________ from college.
#102199
A
graduate
B
has graduated
C
had graduated
D
had been graduated
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The first time I ________ here, it was the year of 1980; this is the third time that I _________ to Chongqing.
#103130
A
came; had visited
B
had come; visited
C
came; have visited
D
had come; have visited
The volleyball match will be put off if it _____. 
#102028
A
will rain
B
rains
C
rained
D
is rained