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题目内容
（安徽广播电视大学-土木工程）
—Are you a teacher?
—No, but I ________ once. I worked in a middle school for three years.
A、am
B、will
C、do
D、was
—No, but I ________ once. I worked in a middle school for three years.
A、am
B、will
C、do
D、was
参考答案
