问题
选择题
I wonder how many years ago ___________.
A．did your father retire
B．has your father retired
C．your father retired
D．your father has retired
答案
答案：C
考查宾语从句。根据从句时间状语how many years ago可知从句叙述的过去的动作，故用过去时态，宾语从句一般用陈述语序，故选C。