--- What is he doing for vacation?-- He’s _______________.
#41642
A
going camp
B
go camp
C
go camping
D
going camping
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—Why didn’t you go to the movie yesterday? —Because I_________it before. 
#42506
A
had watched
B
have seen
C
have watched
D
had seen
He ______ at that school a year ago.
#41915
A
studies
B
study
C
studying
D
studied
--- Where is your mother?--- She _______ to Sichuan on business. She has ______ there four times recently. 
#40456
A
has gone; gone
B
has been; been
C
has gone; been
D
has been; gone