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

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

选项 A、has worked
B、worked
C、works
D、had worked

答案B

解析 考查时态。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。
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