----What did Mr.Jones do before he moved here?

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----What did Mr.Jones do before he moved here?
----He _______ a city bus for over twenty-five years.
A.is driving
B.drove
C.has driven
D.drives

1.答案：B.
2.
1）只有四楼答案正确,以上三楼错矣.
2）用“for + 一段时间”表示的现在完成时必须是指延续到现在为止,但问句中明显含有“before he moved here”这个时间状语,所以是不能用现在完成时的,排除C；
3）也就是说答语所表示的动作都是发生在“he moved here”之前的,根本不可能用现在进行时（表示现在正在发生/进行的动作）A；也不可能用一般现在时D.
4）答案只能选B,用一般过去时,这一点的确也从问句中的what did...do中看出.怎么问怎么答,这是语法规律.
5）最后补充一句,如果答案有had driven倒是可以考虑的.
此为过去完成时,表示截止到过去某一时间时所发生或延续的动作.

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