He ________ in American for five years, and now he works in Shanghai.
#102010
A
have worked
B
worked
C
had worked
D
have been working
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The manager ______ the workers how to improve the program since 9 am.
#102119
A
has told
B
is telling
C
has been telling
D
will have told
 Tiring as it might be, the military training ______ the best opportunity to make lifelong friends.
#103494
A
is believed to be
B
believes as
C
is believed to being
D
believes
When Mary came, I _____ on the piano.
#100254
A
is playing
B
plays
C
was playing
D
played