单项选择题

Our purpose is to make the computer _____ people better.

A．to serve
B．serve
C．serving
D．served
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单项选择题
We will help her if she can _____ her promise to work harder.
A．break
B．fulfill
C．make
D．withdraw
单项选择题
You could become a good musician, but your lack of practice is _____.
A．holding you back
B．holding you on
C．holding you out
D．holding you up
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