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【题目】My uncle ___________as a doctor since he came back from America five years ago.

A.workedB.has workedC.will work

【答案】B

【解析】

句意:我的叔叔自从五年前从美国回来,就一直任职为一名医生。

考查现在完成时。worked工作;has worked工作了;will work将要工作。分析句子结构并由关键词since可知,此处是since+过去时间点five years ago,应用现在完成时,结构为have/has+动词过去分词。故选B

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