My mother ________ in the office since she __________(leave)the college
问题描述：
My mother ________ in the office since she __________(leave)the college
答
My mother have worked in the office since she left the college.
答
has worked left
答
My mother has been in the office since she left the college.
答
My mother (has been) in the office since she (left) the college
答
has been, left
答
My mother has been in the office since she left the college