—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

—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

出自：安徽广播电视大学-土木工程

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