单项选择题

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

A．as
B．that
C．till
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单项选择题
Three of them have gone to the library. What about ______
A．the other
B．the others
C．others
单项选择题
______ the end of last year they had planted 4,000 trees.
A．At
B．By
C．To
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