测量发动机气缸的圆柱度、圆度误差时，首先要确定气缸的（），才能校对量缸表。

A.磨损尺寸

B.标准尺寸

C.极限尺寸

D.修理尺寸

— Look, Linda's been back from the teacher's office.

— She looks sad. Please don't ask her anything _____ she tells you about it. [ ]

A. after  

B. since  

C. while

D. until