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(用法比较)Dr Ma_________in a hospital,but now he works for ORBIS

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(用法比较)Dr Ma_________in a hospital,but now he works for ORBIS on the plane.
A:used to walk B:used to working C:was used to working.
D:was used to work
(用法比较)Dr Ma_________in a hospital,but now he works for ORBIS
选A,应该是used to work ,是打错了吧!
used to do 过去常常做某事,
be used to doing 习惯于做某事,
be used to do被用来做某事 ,
题目是过去在医院工作的意思,所以是A.