Back-formation is considered to be the opposite process of suffi

Back-formation is considered to be the opposite process of suffixation. Which of the following word belongs to back-formation?（ ）
A、babysit
B、classical
C、disobey
D、publicly
【正确答案】：A
【题目解析】：本题考查常见的由逆生法构成的词。classic通过添加形容词后缀-cal构成新词classical；obey通过添加否定前缀dis-构成新词disobey；public通过添加副词后缀-ly构成新词publicly，都属于词缀法构词。而babysit是由babysitter去掉后缀从而逆生构成的新词。逆生法是通过除去假定的后缀而创造新词的方法，与后缀法是相反的过程。故A选项符合题意。