--When did you become a volunteer for the elderly?-- Two years ago. I ______ this group since then.
#41941
A
joined
B
took part in
C
have joined
D
have been in
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My sister____Beijing tomorrow. She works there.
#40626
A
leaves
B
is leaving for
C
leaves for
D
is leaving
Ten years ago _______ only one building in our school. And in 10 years, _______ five buildings in our school.
#41816
A
there will be; there are
B
there was; there are
C
there was; there will be
D
there will be; there was
—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