— Are you a teacher?— No but I . I worked in a middle school for three years.A. amB. will

问题补充：

— Are you a teacher?

— No, but I . I worked in a middle school for three years.

A. am

B. will

C. do

D. was

答案：

A. am

B. will

C. do

(答案→)D. was

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