(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3.5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3.5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：黑龙江省教育学院口语(专升本)

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