题目内容
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 |
B
解析
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题目内容
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 |
B
解析