They ______ on the program for almost one week before I joined them.A、had been w

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问题 They ______ on the program for almost one week before I joined them.

选项 A、had been working
B、bad worked
C、have been working
D、have worked

答案 A

解析根据句意应该选过去完成进行时，表示work on这个动作在 joined以前发牛，而且．我加入以后还在继续，故用过去完成进行时。答案为A。

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