I'm not sure whether he has finished writing the book, but he ____ it last month. [ ]A. worked at B. was working on C. worked on D. was working at -高中英语-n多题

◎ 题干

I'm not sure whether he has finished writing the book, but he ____ it last month.

[ ]

A. worked at
B. was working on
C. worked on
D. was working at

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