----Was his father strict with him when he was at school? ----Yes. He had never praised him _____he became one of the top student in his grade.
A.fter
B.unless
C.until
D.when
正确答案是C
----Was his father strict with him when he was at school? ----Yes. He had never praised him _____he became one of the top student in his grade.
A.fter
B.unless
C.until
D.when
正确答案是C