—No one answered when I phoned this morning. Where were you?—Ifor teeth in the dental clin

问题补充：

—No one answered when I phoned this morning. Where were you?

—Ifor teeth in the dental clinic.

A. was being treated

B. have been treated

C. was treated

D. Treated

答案：

(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。