Tell me how it came about that you were 20 minutes late for class. You needn’t go into details.
A. in advance
B. in vain
C. in total
D. in brief
网友回答
A. in advance
B. in vain
C. in total
(答案→)D. in brief
解析：考察介词短语辨析。A提前，事先；B徒劳；C总共；D简洁地；句义：简洁地告诉我你迟到20分钟是怎么回事情。你不需要说得很详细。故D正确。