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

问题补充：

--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

答案：

A. after

B. unless

(答案→)C. until

D. when

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