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Our math teacher___in our school for 20 years and he___here

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Our math teacher___in our school for 20 years and he___here when he was 23 years old.
A.has thought ; has come B.thought ; comes C.thought ; came D.has thought ; came
Our math teacher___in our school for 20 years and he___here
选D
1.现在完成时,has taught ...for 20 years,表示一段时间时要与完成时连用
2.一般过去时,后面有表示过去的时间,以when引导的状语从句表示,所以用came .