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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  
人气:451 ℃ 时间:2019-11-22 07:32:57
解答
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.
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