“他不到黄河不死心。”这句是（）。
A.单句
B.复句
C.紧缩句
参考答案：C
— Did your father come back early last night?
— Yes. It was not yet eight o'clock ____ he arrived home. [ ]
A. before
B. when
C. that
D. until
压力容器年度检查时的主要内容和方法？
