问题描述：
单选Lucy's father was very strict with her and he never praised her
Lucy's father was very strict with her and he never praised her ____ she became one of the top students in her grade.
A.after
B.unless
C.until
D.when
B为什么不对?
Lucy's father was very strict with her and he never praised her ____ she became one of the top students in her grade.
A.after
B.unless
C.until
D.when
B为什么不对?
问题解答：
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