单项选择题

I got a new battery for my recorder only last week, but it seems to have ______ already.

A．worn out
B．run down
C．knocked off
D．gone off
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单项选择题
All the references she has obtained for her doctoral dissertation ______ about twenty items.
A．make up for
B．add up to
C．come up with
D．put up with
单项选择题
She claims to be very learned in biochemistry, but in fact ______ she knows about it is all sadly out of date.
A．so little
B．that much
C．what little
D．how much
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