I wonder how many years ago____________.

many years ago~

一般过去时，很多年前，是已经发生过的事情，

宾语从句啊
翻译过来是“我想知道你父亲已经退休多少年了”
wonder是动词“想知道”的意思
后面得句子是一个宾语从句

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. 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。

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。

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