They _________ on the program for almost one week before I joined them, and now we are still working on it as no good results have e out so far
A.have worked
B.had worked
C.have been working
D.had been working
网友回答
D解析考查时态。句意：在我加入他们之前，他们一直在这个项目上工作了将近一个星期。结合语境可知本句描述的在过去已经完成的正在进行的动作，故用过去完成进行时态，选D。