I want to know ______ for the class yesterday morning. [ ]

A. why did you come late

B. why you came late

C. why do you come late

D. why have you come late

角度测量过程中，水平度盘、竖盘及其相应指标线间转动关系为（）。

A.水平度盘不动，指标线移动；竖盘不动，指标线移动

B.水平度盘转动，指标线不动；竖盘转动，指标线不动

C.水平度盘不动，指标线移动；竖盘转动，指标线不动

D.水平度盘转动，指标线不动；竖盘不动指标线移动