What did Mr.Smith do before he moved here?

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What did Mr.Smith do before he moved here?
He ___a city bus for over twenty years.
A.is driving B.drove C.has driven D.drives
由此类推,下面这道是否选A
My uncle ____in No.1 Middle school ever since he graduated from Beijing University.
A.teaches B.has taught C.had taught D.taught

不是A 是B,第一题问句中did很重要,表明是对一般过去的提问,而且现在Mr.Smith 现在已经不在做那项工作了,所以用一般过去时drove.
第二题 ever since he graduated from Beijing University是一个完成时态的一般标志,根据句意,是说“My uncle 毕业后就在No.1 Middle school 执教了”而且这个动作一直到现在,他现在依然在执教,所以用现在完成时态,选has taught ,

What did Mr.Smith do before he moved here? ----What did Mr.Jones do before he moved here? What did Mr Jones do before he moved here?--He( ) a city bus What did Mr Jones do before he moved here?He___a city bus fo ( ) 30.–What did Mr Jones do before he moved here? What did Mr green do before he came here He ---a taxi for mo 填空 what did Mrs Green do before she moved here?She_____a dou What did he do before going home at night? He listened to me--what Mr.Smith had said the day before. what did he say?Mr Smith asked___Jack was a good student A.t Mr. Smith _______ that he did not want to go for a trip what Mr white_______in this school for20 years before he moved to