题目内容

(2010·浙江余杭高级中学高三上第二次月考)      17. They _____ on the program for almost one week before I joined them, and now we _____ it as no good results have come out.

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

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