单项选择题

Bob won't stop trying ______ he gets what he wants.

A．
A. as

B．
B. that

C．
C. till

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单项选择题
You'd better ______ your computer before we use it again.
A．
A. see

B．
B. check

C．
C. begin
单项选择题
I ______ the picture from the wall in order to clean it.
A．
A. set up

B．
B. took down

C．
C. looked at
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