I wonder how many years ago____________.A、did your father retire B、your father retired C、has your father retired D、your father has retired

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Iwonderhowmanyyearsago____________.A、didyourfatherretireB、yourfatherretiredC、hasyourfatherretiredD、y

I wonder how many years ago____________.A、did your father retire B、your father retired C、has your father retired D、your father has retired
I wonder how many years ago____________.
A、did your father retire  B、your father retired  C、has your father retired  D、your father has retired  

I wonder how many years ago____________.A、did your father retire B、your father retired C、has your father retired D、your father has retired
B.your father retired
ago表示了后面必须描写一件发生过的事,已经在当时完结了.
然而后面两个选项都是描写了一种持续的状态.

答案是B.
这是一个发生在许多年前的动作,要用过去时,首先排除C和D。wonder 后面接宾语从句时句子不能倒装,再排除A。答案是B.

B.how many years ago是过去的一个时间点,用一般过去时。另外,wander后面跟的是名词从句,不是疑问句,应该用陈述句句型。