5.—Are you a teacher?—No, but I_________. I worked in a middle school for three years.
A.am
B.will
C.do
D.was
正确答案是D
5.—Are you a teacher?—No, but I_________. I worked in a middle school for three years.
A.am
B.will
C.do
D.was
正确答案是D