题目

（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 答案：A

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