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They____on the program for almost one month before l was arranged to help them. Now, we____on it as no result has 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
科目 英语   题型 单选题   难度 较难
知识点: 动词语态
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