摘要：31．--- Was his father strict with him when he was at school ? --- Yes． He had never praised him he became one of the top students in his grade． A． after B． unless C． until D． when
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--Was his father strict with him when he was at school?
--Yes. He had never praised him ________ he became one of the top students in his grade.
[ ]
A．after
B．unless
C．until
D．when
--Was his father strict with him when he was at school?
--Yes. He had never praised him ________ he became one of the top students in his grade.
[ ]
A．after
B．unless
C．until
D．when
－Was his father strict with him when he was at school?
－Yes．He had never praised him ________ he became one of the top students in his grade．
[ ]
A．after
B．unless
C．until
D．when