麻烦老师解答：They ____ on the pro

来源：学生作业帮编辑：搜搜考试网作业帮分类：英语作业时间：2024/06/10 11:56:33

They ____ on the program for almost one week before I joined them,and now we _____ on
it as no good results have come out so far.

[ ]

A.had been working; are still working
B.had worked; were still working
C.have been working; have worked
D.have worked; are still working

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