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-Was his father very strict with him when he was at school?-Yes．He hed never praised him()he became one of the topstudents in his grade．

A、after

B、unless

C、until

D、when

时间：2021-12-31 20:09 关键词：

答案解析

C
C[解析]not…until．．．句式，其意为“直到……才……”．