Mr. Smith, who_______ as a teacher in our school for about 20 years, is now our

Mr. Smith, who_______ as a teacher in our school for about 20 years, is now our mayor.

has worked

worked

works

had worked

优质答案

正确答案

本题考查时态

B选项，句意为“史密斯先生在我们学校做了20年老师，他现在是市长”。根据后面的is now our mayor可知，过去20年是老师，现在不是了，强调过去的事实，所以用一般过去时。综上，B选项正确。

A选项，现在完成时，与题干时态不符，故排除。

C选项，一般现在时，与题干时态不符，故排除。

D选项，过去完成时，与题干时态不符，故排除。

故正确答案为B项。

解析

解析同上

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