—Why didn’t you answer my phone at 10 am? —I for my decayed tooth in the clinic.A. treated

问题补充：

—Why didn’t you answer my phone at 10 am?

—I for my decayed tooth in the clinic.

A. treated

B. was treated

C. have been treated

D. was being treated

答案：

A. treated

B. was treated

C. have been treated

(答案→)D. was being treated

解析：为什么没接我电话？ 我正在诊所治疗我的蛀牙。 根据语境打电话是在过去所以治疗是在过去某时间正在发生的事情所以要用过去进行时态，选D