Miss. Gao _______ in the library for three years. But now she is a teacher.
#102018
A
worked
B
has worked
C
had worked
D
has been working
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Hi, Bill. I _____ you _____ in this city. How long have been here?
#103680
A
didn’t know; were
B
don’t kow; are
C
haven’t known; are
D
don’t know; were
The film _______ for twenty minutes when they got to the cinema. 
#103330
A
had already been on
B
has already been on
C
had already begun
D
has already begun