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 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