Students in English-speaking countries usually address their man teacher ‘sir”, but their

Students in English-speaking countries usually address their man teacher ‘sir”, but their woman teacher “madam”.
A. seldom they address
B. do they seldom address
C. seldom do they address
D. they seldom do address

A. seldom they addressB. do they seldom address(答案→)C. seldom do they addressD. they seldom do address解析：seldom很少，否定含义，放在句首，句中的主谓要用倒装结构。句意：讲英语国家的学生通常尊称其男教师为“先生”，但很少称其女教师为“女士”。

对的，就是这个意思