--- Where do you think ______ he ______ the computer? --- Sorry. I have no idea.
#104269
A
has; bought
B
不填; bought
C
did; buy
D
不填; buys
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Salley________Beijing for Shanghai and________there ever since. You can go and pay her a  visit on your way to Hangzhou. 
#104697
A
has left; worked
B
left; worked
C
has left; had worked
D
left; has worked
By the time Billy was 6, he         in the sea.
#101498
A
had already swum
B
was already swimming
C
has already swum
D
already swam