单项选择题

A．fill
B．hold
C．involve
D．press
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单项选择题
What does the woman imply that Katherine should be doing
A．Studying microbiology for a year.
B．Teaching biology.
C．Taking a nap.
D．Taking a different course.
单项选择题
What instrument does the director of the group play in the city of orchestra
A．Cello.
B．Viola.
C．Violin.
D．Bass.
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