Question

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

Answer 1

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。