—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 |
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