题目

-- Was his father very strict with him when he was at school?     --- Yes. He will never praise him _____ he becomes one of the top students in his grade.   A. after                            B. unless                              C. until                                 D. when 答案：B已知，那么的终边坐在象限为(    ) A．第一象限         B．第二象限          C．第三象限         D．第四象限