They on the program for almost one week before I joined them, and now, we on it as no good results have e 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
网友回答
(答案→)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
解析：句意：在我加入他们之前，他们一直为这项计划工作了几乎一周，我们现在还在继续进行因为现在到目前为止还没有出现好的结果。第一空根据时间状语before I joined them，可知表示在过去某个时间之前一直进行的动作，用过去完成进行；第二空表是现在正在进行，故选A。