问题
选择题
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
答案
答案：A
题目分析:句意：我在加入他们之前，他们从事这个项目已经有几乎一周的时间了，现在我们仍然在做这个项目，因为到目前为止还没有好的结果出来。根据时间状语从句before I joined them可以判断主句应该用过去完成时，而后句中的now决定了第二个空的时态是现在时态，故答案选A。