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Mr. Smith, who_______ as a teacher in our school for about 20 years, is now our mayor.
A.has worked
B.workeD.C.works
D.had workeD.
B.workeD.C.works
D.had workeD.
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参考解析
解析：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。
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。
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