I’m not sure whether be has finished writing the book, but he it last month.A. worked at B

发布时间：2020-08-16 08:06:59


I’m not sure whether be has finished writing the book, but he     it last month.
A. worked at
B. was working on
C. worked on
D. was working at

网友回答

A. worked at
(答案→)B. was working on
C. worked on
D. was working at
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