问题
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
B:had worked; were still working
C:have been working; have worked
D:have worked; are still working
正确答案是：
同类题型
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