I don’t know when he ____. But if he ____, I’ll ring you up.
#41562
A
comes, will come
B
will come, will come
C
comes, comes
D
will come, comes
推荐题目
---How often ___________ the Olympics _____________? ---Every four years. 
#42174
A
is, taken place
B
is, hold
C
does, hold
D
does, take place
While the alien ________ the museum, the boy called the TV station.
#37872
A
visiting
B
was visiting
C
visited
D
visit