—Was his father very 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 very 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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