They____the maths problem when I came in.

They____the maths problem when I came in.

题目
They____the maths problem when I came in.
A.worked on B.were working on C.were working D.were working for
答案
B.句型
举一反三
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奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
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