—No one answered when I phoned this morning. Where were you?
—I for teeth in the dental clinic.
A. was being treated
B. have been treated
C. was treated
D. Treated
网友回答
(答案→)A. was being treated
B. have been treated
C. was treated
D. Treated
解析：考查时态。根据上一句when I phoned thins morning 可知，问的是过去发生的动作。故排除B。此处为谓语，排除D 句意为我当时正在牙医诊所接受治疗。