问题
选择题
They _______ on the program for almost one week before I joined them, and now we ________ 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
检查考生对动词时态的掌握和运用能力。第一空，时间状语从句before I joined them决定了要使用响应的过去时态；第二空，now 决定了要使用现在时态。