Dr. Ma used to __________in a hospital. ...

Dr. Ma used to __________in a hospital.

A．work

B．works

C．worked

D．working

A 【解析】试题分析:此题考查的重点是used to do sth表示过去经常做某事,故选A表示马先生过去在医院里工作. 考点：used to do sth的基本用法.

考点分析：

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