She has (work) as a nurse for three years.

题目

She has (work) as a nurse for three years.
为什么填 worked 请说明原因,

答案

那是现在完成时
现在完成时用来表示已发生或完成的动作或状态,其结果的确和现在有联系,动作或状态发生在过去但他的影响现在还存在
例子：
SOMEONE HAS BROKEN MY WINDOW.（结果现在窗户还是破的）