这道题的解题过程是？They ______ on the p
They______ontheprogramforalmostoneweekbeforeIjoinedthem,andnowwe_______onitasnogoodre...
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. [ ] 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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