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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Mymother_____mathematicsinmyhometowneversinceshegraduatedfromtheuniversity.taughtteaMymother_____mat

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
完成时表示状态的延续.

C
since是完成时的标志

has taught
因为后面是since,前面用完成时