My mother _____ mathematics in my hometown ever since she graduated from the university.taught teaMy mother _____ mathematics in my hometown ever since she graduated from the university.taught teaches has taught is teaching

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My mother _____ mathematics in my hometown ever since she graduated from the university.taught teaMy mother _____ mathematics in my hometown ever since she graduated from the university.taught teaches has taught is teaching
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My mother _____ mathematics in my hometown ever since she graduated from the university.taught teaMy mother _____ mathematics in my hometown ever since she graduated from the university.taught teaches has taught is teaching
My mother _____ mathematics in my hometown ever since she graduated from the university.taught tea
My mother _____ mathematics in my hometown ever since she graduated from the university.
taught
teaches
has taught
is teaching

My mother _____ mathematics in my hometown ever since she graduated from the university.taught teaMy mother _____ mathematics in my hometown ever since she graduated from the university.taught teaches has taught is teaching
has taught
自从她毕业后就一直在教数学.
完成时亦可表示状态的延续.

has taught
现在完成时:过去某一时间开始并一直持续到现在的动作或状态。