(单选题) 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. ( )(本题2.0分) 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

(单选题) 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. ( )(本题2.0分)
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

出自：西南石油大学-机电一体化技术-大学英语

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