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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. ( )(本题2.5分)
A、 had been working; are still working
B、 had worked; were still working
C、 have been working; have worked
D、 have worked; were still working
A、 had been working; are still working
B、 had worked; were still working
C、 have been working; have worked
D、 have worked; were still working
参考答案