“Was his father very strict with him when he was at school?” “Yes. He had never praised hi

“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

A. afterB. unless(答案→)C. untilD. when解析：考查 not…until… 句式，其意为“直到……才……”。

就是这个解释

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