单项选择题

You’d better ______ your computer before we use it again.

A. see
B. check
C. begin
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I ______ the picture from the wall in order to clean it.
A. set up
B. took down
C. looked at
单项选择题
He won’t stop trying ______ he gets what he wants.
A. as
B. that
C. till
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