My mother _____ mathematics in my hometown ever since she graduated from the university.taught tea

题目

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

答案

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.