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
He came and ______ without saying a word.
A． go
B． went
C． going
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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