请问这种主从句的句子时态有什么规律吗?比如主句过去时,从句一般用什么时态?

请问这种主从句的句子时态有什么规律吗?比如主句过去时,从句一般用什么时态?
1.My mind wasn’t on what he was saying ,so I' m afraid I ______ half of it.
A.was missing B.had missed C.will miss D.missed