几道英语题 帮忙解释一下 啊 谢谢 很急の。。

1·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 before C until D unless
2 Be sure to write to us ,__________?
A will you B aren't you C can you D mustn' you

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