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--She is ________ doctor. She works in a hospital.
[ ]
A
B
C
D
Is there ________ old tree behind your house?
A．a B．the C．an D．／
I’m going to learn________ instrument next year．
A．an
B．the
C．a
D．／
Here is ________ action movie.
Look! There is______________ African Elephant over there.
A．a
B．an
C．the